Answer:
3/52
Step-by-step explanation:
The picture card are j,q k and there are 4 of each so there are 12 picture cards
P( picture card) = picture card/ total
12/52 = 3/13
Then replace the card
There are 13 clubs
P( club) = club/ total
13/52 = 1/4
P(picture,replace,club) = 3/13*1/4 = 3/52
Five times the sum of a number and 13 is 20. Find the number
Answer:
x = -9
Step-by-step explanation:
Step 1: Write out expression
5(x + 13) = 20
Step 2: Distribute
5x + 65 = 20
Step 3: Isolate x
5x = -45
x = -9
And we have our answer!
Answer:
-9
Step-by-step explanation:
Let the number be x.
5(x+13) = 20
Expand.
5x+65 = 20
Subtract 26 on both sides.
5x = 20 - 65
5x = -45
Divide 5 into both sides.
x = -45/5
x = -9
The number is -9.
The process used to collect data will __________ of the study.
affect the validity and the bias
affect only the validity
affect only the bias
not affect the validity and the bias
The process used to collect data will affect the validity and the bias of the study.
What is validityThe way data is gathered is very important for making sure a study is accurate and doesn't have any unfair influences. Validity means how well the information collected correctly shows the things the study is trying to find out. If the way data is collected is not done correctly, it can cause incorrect or untrustworthy results, making the study less reliable
Bias means when we make mistakes or go away from the correct value or truth. If the way we collect data is biased, it can lead to unfair outcomes or favor certain groups.
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PLEASE ANSWER, URGENT!!! In a math exam, Zach, Wendy, and Lee have an average score 91. Wendy, Lee and Chen have an average score 89. Zach and Chen have an average score 95. What is Zach's score?
Answer:
98
Step-by-step explanation:
Z as Zach; W as Wendy; L as Lee; C as Chen
We know that average score of Z,W, and L is 91, so:
(z + w + l)/3 = 91
z + w + l = 273
Average score W, L, C = 89, so:
(w + l + c)/3 = 89
w + l + c = 267
We take both:
(z + w + l) – (w + l + c) = 273 – 267
z – c = 6
Average score Z and C = 95
(z + c)/2 = 95
z + c = 190
(z + c) – (z – c) = 184
2c = 184
c = 92
z + c = 190
z + 92 = 190
z = 98
So, Zachs score is 98
There are 7 times as many female students as male students at a university. What fraction of the university are female
Let’s give total students a number. Let’s say there are 800 total students
Men = x
Women = 7x. ( 7 times more)
Together there are 8x students.( 7x + x)
We have 8 x = 800
Divide both sides by 8
X = 100
100 men
700 women
Now find the fraction which is number of women / total students = 700/800 = 7/8
7/8 of the students are women.
Two random samples were drawn from two employers to obtain information about hourly wages. Use the following information and the PopMeanDiff template to determine if there is a significant difference in wages across the two employers.
Kroger Wal-Mart
Sample size 80 60
Sample mean $6.75 $6.25
Population standard deviation $1.00 $0.95
The p-value is _____.
a. 0.0026
b. 0.0013
c. 0.0084
d. 0.0042
Answer:
a) 0.0026
P- value is 0.0026
Step-by-step explanation:
Step(i):-
Given data
first sample size n₁= 80
mean of the first sample x⁻₁= $6.75
Standard deviation of the first sample (σ₁) = $1.00
second sample size (n₂) = 60
mean of the second sample( x₂⁻) = $6.25
Standard deviation of the second sample (σ₂) = $0.95
step(ii):-
Test statistic
[tex]Z = \frac{x^{-} _{1} -x^{-} _{2} }{\sqrt{\frac{(S.D)_{1} ^{2} }{n_{1} } +\frac{(S.D)_{2} ^{2} }{n_{2} } } }[/tex]
Null Hypothesis :H₀: There is no significant difference in wages across the two employers.
x⁻₁= x₂⁻
Alternative Hypothesis :H₁: There is significant difference in wages across the two employers.
x⁻₁≠ x₂⁻
[tex]Z = \frac{6.75 -6.25 }{\sqrt{\frac{(1^{2} }{80 } +\frac{((0.95)^{2} }{60} } }[/tex]
Z = 3.01
P- value:-
Given data is two tailed test
The test statistic Z = 3.01
First we have to find the Probability of z-statistic
P(Z>3.01) = 1- P( z <3.01)
= 1- (0.5 + A(3.01)
= 0.5 - A(3.01)
= 0.5 - 0.49865 ( from normal table)
= 0.0013
P(Z>3.125) = 0.0013
Given two tailed test
P- value = 2 × P( Z > 3.01)
= 2 × 0.0013
= 0.0026
Final answer:-
The calculated value Z = 3.125 > 1.96 at 0.05 level of significance
null hypothesis is rejected
Conclusion:-
P- value is 0.0026
The selection of a password of a computer account has the followingrestrictions: The password must be 6, 7, or 8 characters long. A charactercan be lower case letter or a decimal digit. The first character must be alowercase letter. Determine the total number of possible passwords with thegiven restrictions
Answer:
2,095,636,800,000 possible passwords.
Step-by-step explanation:
There are:
26 lower case characters.
10 decimal digits.
Passwords with 6 characters:
The first character must be a lower case letter, so 26 possible outcomes.
Any of the other 6 - 1 = 5, there are 36 possible options. So
[tex]T_{6} = 26*36^{5} = 1572120576[/tex]
Passwords with 7 characters:
Same logic as above, just the last 6 with 36 possible options. So
[tex]T_{7} = 26*36^{6} = 56596340736[/tex]
Passwords with 8 characters:
7 with 36 possible options
[tex]T_{8} = 26*36^{7} = 2037468300000[/tex]
Total:
[tex]T = T_{6} + T_{7} + T_{8} = 1572120576 + 56596340736 + 2037468300000 = 2095636800000[/tex]
2,095,636,800,000 possible passwords.
Which of the following equations describes the line shown below? Check all
that apply.
Answer:
Correct options are F and D.
Step-by-step explanation:
First, the slope. 5-(-5)/-4-1
This can be simplified to 10/-5, or -2.
Y intercept: (0, -3).
Slope intercept form: y=-2x-3
Point slope: y-5=-2(x+4) or y+5=-2(x-1)
Find the volume of this cone.
Round to the nearest tenth.
10ft
8ft
[? ] ft
Answer:
V ≈ 670.2 [tex]ft^3[/tex]
Step-by-step explanation:
Use the formula of the volume of a cone, which is [tex]V=\pi r^{2} \frac{h}{3}[/tex]
Plug in your given components and solve for V:
[tex]V=\pi (8)^2\frac{10}{3} \\V=\pi (64)\frac{10}{3} \\V=\pi (64)(3.33)\\V=\pi (213.33)\\V=670.2[/tex]
7. Evaluate 4P2
O
22
O
12
O
14
5
Answer:
12Step-by-step explanation:
To evaluate 4P2, we will use the permutation formula as shown;
nPr = [tex]\frac{n!}{(n-r)!}[/tex]
4P2 = [tex]\frac{4!}{(4-2!}[/tex]
[tex]= \frac{4!}{2!} \\= \frac{4*3*2!}{2!}\\ = 4*3\\= 12[/tex]
4P2 = 12
Please heeeelllllllpppppp
Answer:
point A90°CCWStep-by-step explanation:
a) All of the arcs show point A is the center of rotation.
__
b) The angle marked at point A is 90°.
__
c) The arrows indicate the direction of rotation is counterclockwise.
The remainder when 2x^2-x-5 divided by (x-3) is
Answer:
10
Step-by-step explanation:
2x^2-x-5= 2x^2-6x + 5x -15 +10= 2x(x-3) +5(x-3) + 10= (2x+5)(x-3) + 10
(2x^2-x-5)/(x-3)= 2x+5 + 10/(x-3)
So the remainder is 10
Assume that 1700 births are randomly selected and 4 of the births are girls. Use subjective judgment to describe the number of girls as significantly high, significantly low, or neither significantly low nor significantly high.
Answer: Significantly low.
Step-by-step explanation:
Ok, we know that out of 1700 randomly selected, only 4 of them are girls.
Then the frequency is:
p = 4/1700
Now, using the subjective judgement (meaning that it is based on the opinion only, there is no real math involved)
I can conclude that the number of girls is significantly low, meaning that out of 1700 births we have 4 girls, then the other 1694 must be boys.
Question 10 of 32
1 Point
The standard form of the equation of a parabola is
y=1x2 - 4x +21. What is the vertex form of the equation?
O A. y =(x+4)2 +13
O B. y=2(x+4)2 +21
C. y = 2(x-4)2 + 21
D. y = -(x-4)? +13
i thinhk is C DONT NOW
. Draw a unit circle. A unit circle is a circle whose radius is 1 and whose center is located at the origin of a rectangular coordinate system. On this unit circle let θ be the angle measured from the positive x‐axis to the point P = (x, y). Label the angles 0, 6 , 4 , 3 , 2 , , 2 3 , 2 and the coordinates of the points on the unit circle that correspond to each of these angles. 2. Plot the point 2 3 , 2 1 . How can you check that the point is on the unit circle? (Hint: recall the equation of the unit circle). Plot the points symmetric to it with respect to the y-axis, to the x-axis, and to the origin. Label the coordinates of the points you found. Find positive angles (expressed in radians) which correspond to the points. 3. Explain how symmetry can be used to find the coordinates of points on the unit circle for angles whose terminal sides are in quadrants II, III, and IV. 4. If x, y is a point on the unit circle in quadrant I and if 2 3 x , what is y ? 5. Find two negative and three positive angles, expressed in ra
Answer:
When drawing a rectangle the point of origin is P = xy and the 0 be upon the positive x axis back to P this way we have a rectangle length.
The circle is inscribed in the middle of the rectangle.
Step-by-step explanation:
0,6 as this is 1/6th of circle
9,45 as this is 3/9th of a circle
36, 22.5 as this is 5/10 of a circle
-27, -16.5 as this is 7/10 of a circle
When we join up -27 to 0 with the end line of a rectangle the base, we find it is at point for -16 for y and joined to 6 at y and has formed 10/10 of a circle.
This is not correct but may help as they are in proportion.
Write an equation in standard form for a line that passes through (2, 2) and (0, -3).
Answer:
y=(5/2)x-3
Step-by-step explanation:
slope of the line=(y2-y1)/(x2-x1)=(-3-2)/(0-2)=5/2
use any point to get the line:
y-(-3)=(5/2)(x-0)
y=(5/2)x-3
The is it mean, range, mode, or median of the following set of data is 6. 13, 7, 9, 5, 2, 3, 5, 4, 10, 12
the way you have laid this question out is strange but im assuming you want me to find the mean, range, medium and mode of the numbers provided?
Answer:median=order them and find the middle= 6
mean=add them all up and divide by the amount of numbers=(6+13+7+9+5+3+2+5+4+10+12)/11=6.9
range= the difference between the smallest and largest number=13-2=11
mode= the one that appears the most= 5
An anatomy teacher hypothesizes that the final grades in her class are distributed as 10% A's, 23% B's, 45% C's, 14% D's, and 8% F's. At the end of the semester, she has the following grades.
A 6
B 14
C 22
D 8
E 4
Test her claim at 5% significance level.
Answer:
At a plus or minus 5%
Her claim is wrong
Step-by-step explanation:
Ok..
Let's calculate the total amount of result first.
6 +14+22+8+4= 54.
Let's take the percentage of each.
For A
6/54= 0.11
11.1%
11.1%*5%= 10.5
For B
14/54
=0.25925
= 25.9%
25.9%*5%= 24.605
For C
22/54
0.4074
40.7%
40.7*5%= 42.73%
For D
8/54
= 0.148
14.8%
14.8%*5% = 14.06%
For E
4/54
= 0.074
= 7.4%
7.4%*5%=7.77%
But she suggested
10% A's, 23% B's, 45% C's, 14% D's, and 8% F's
What is the explicit formula for this sequence?
-1, -4, -16, -64, ...
Answer:
a, ar, ar²,ar³,ar⁴...
Rata-rata markah matematik untuk Amin, azman dan aziz adalah 73. Tanda Azman lebih 35 berbanding Amin manakala aziz dua kali ganda daripada Amun. Apakah tanda Amin?
Answer:
The Amin's score in math was 46.
Step-by-step explanation:
The question is:
The average math score for Amin, azman and aziz is 73. Azman marks 35 more than Amin while aziz is twice that of Amun. What is Amin's sign?
Solution:
Let us denote that:
x = Amin's score in math
y = Azman's score in math
z = Aziz's score in math.
The average of x, y and z is, 73.
That is:
[tex]\frac{x+y+z}{3}=73\\\\\Rightarrow x+y+z = 219[/tex]
Now it is provided that:
[tex]y=x+35...(i)\\z=2x...(ii)[/tex]
Use the equations (i) and (ii) to determine the value of x as follows:
[tex]x+y+z=219\\\\x+x+35+2x=219\\\\4x=184\\\\x=46[/tex]
Thus, the Amin's score in math was 46.
Find the equation of the line given
the gradient
Parrallel to the line y= - 2x+4
point ( 1-3)
Answer:
y = -2x - 1
Step-by-step explanation:
Step 1: Find the parallel line
y = -2x + b
Step 2: Solve for b
-3 = -2(1) + b
-3 = -2 + b
b = -1
Step 3: Write parallel equation
y = -2x - 1
Use the end behavior of the graph to solve 3x^3+9x^2-12x < 0
Answer:
1. x = 4
2. x = -1
3. x = 0
Answer:
Step-by-step explanation:
A student is given data that follows a normal distribution. According to the data, the mean amount of time that students spent reading outside of school each month was 10 hours, and the standard deviation was 2 hours. The student creates a normal distribution curve to model the situation and labels the curve so that 34% of the students fall in the range between 10 and 12 hours. Select the information that justifies the student's labeling.
a. Only 68% of the students will fall in the range of 10- 2 and 10 + 2 hours.
b. Only 95% of the students will fall in the range of 10-2 and 10+2 hours
c. Only 68% of the students will fall in the range of 10-6 and 10+6 hours
d. Only 95%of the students will fall in the range of 10 -8 and 10 + 8 hours.
Answer:
a. Only 68% of the students will fall in the range of 10- 2 and 10 + 2 hours.
Step-by-step explanation:
He appies the empirical 68-95-99.7 rule, where 68% of the data is expected to be within ne standard deviation from the mean, to the right and to the left.
Half of this (68%/2=34%) will be between the mean and one deviation standard to the right. This is between 10 hours and 10+2=12 hours.
The right answer is:
a. Only 68% of the students will fall in the range of 10- 2 and 10 + 2 hours.
Can someone plz help me solved this problem! I’m giving you 10 points! I need help plz help me! Will mark you as brainiest!
Hey there! :)
Answer:
a. 3
b. -22
c. -2
d. -2
e. 5a + 8
f. a² + 6a + 3
Step-by-step explanation:
Calculate the answers by substituting the values inside of the parenthesis for 'x':
a. f(1) = 5(1) - 2 = 3
b. f(-4) = 5(-4) - 2 = -22
c. g(-3) = (-3)² + 2(-3) - 5 = 9 - 6 - 5 = -2
d. g(1) = 1² + 2(1) - 5 = 1 + 2 -5 = -2
e. f(a+ 2) = 5(a+2) - 2 = 5a + 10 - 2 = 5a + 8
f. g(a + 2) = (a + 2)² + 2(a + 2) - 5 = a² + 4a + 4 + 2a + 4 - 5 =
a² + 6a + 3
whats the answers to this ?
Answer:
Hi there!
The correct answers are: A, B, D, E
Step-by-step explanation:
First of all, perpendicular means when two lines intersect to form a 90° angle.
Second ⊥ means perpendicular.
When something is a bisector it means it evenly slices a line in half.
25x^4 +120x^2y +144y^2
Answer:
We can factor this into (5x+12y)^2
Step-by-step explanation:
Suppose the time it takes a barber to complete a haircuts is uniformly distributed between 8 and 22 minutes, inclusive. Let X = the time, in minutes, it takes a barber to complete a haircut. Then X ~ U (8, 22). Find the probability that a randomly selected barber needs at least 14 minutes to complete the haircut, P(x > 14) (round answer to 4 decimal places) Answer:
Answer:
[tex] P(X>14)= 1-P(X<14) =1- F(14)[/tex]
And replacing we got:
[tex] P(X>14)= 1- \frac{14-8}{22-8}= 0.5714[/tex]
The probability that a randomly selected barber needs at least 14 minutes to complete the haircut is 0.5714
Step-by-step explanation:
We define the random variable of interest as x " time it takes a barber to complete a haircuts" and we know that the distribution for X is given by:
[tex] X \sim Unif (a= 8, b=22)[/tex]
And for this case we want to find the following probability:
[tex] P(X>14)[/tex]
We can find this probability using the complement rule and the cumulative distribution function given by:
[tex] P(X<x) = \frac{x-a}{b-a} ,a \leq x \leq b[/tex]
Using this formula we got:
[tex] P(X>14)= 1-P(X<14) =1- F(14)[/tex]
And replacing we got:
[tex] P(X>14)= 1- \frac{14-8}{22-8}= 0.5714[/tex]
The probability that a randomly selected barber needs at least 14 minutes to complete the haircut is 0.5714
Hoping to increase the chances fo reaching a performance goal, the director of a research project has assigned three separate research teams the same task. The director estimates that the team probabilities are 0.90, 0.80, 0.70 for successfully completing the task in the allotted time. Assuming that the teams work independently, what is the probability that the task will NOT be completed in time
Answer:
P = 0.006
Step-by-step explanation:
If the first team have a probability of 0.9 to complete the task, we can said that the probability to not complete the task in time is 0.1. It is calculated as:
1 - 0.90 = 0.1
At the same way, the probability to not complete the task for the second and third team are 0.2 and 0.3 respectively and they are calculated as:
1 - 0.80 = 0.2
1 - 0.70 = 0.3
Finally, the the probability that the task will NOT be completed in time is the probability that any of the teams completed the task. So, it is equal to:
P = 0.1 * 0.2 * 0.3 = 0.006
Data was collected for a sample of organic snacks. The amount of sugar (in mg) in each snack is summarized in the histogram below. 2 4 6 8 10 12 14 amount of sugar (mg) 60 80 100 120 140 160 180 200 Frequency What is the sample size for this data set
Answer:
The sample size for the data set = 56
Step-by-step explanation:
The sample size or number of individuals (n) is gotten from a histogram by summing up the total frequencies of occurrences.
In this example, the frequencies are: 2 4 6 8 10 12 14
Therefore, the sample size (n) is calculated as follows:
n = 2 + 4 + 6 + 8 + 10 + 12 + 14 = 56
Therefore the sample size for the data set = 56
The sample size for the data set = 56
Given that,
Data was collected for a sample of organic snacks.The calculation is as follows:
= 2 + 4 + 6 + 8 + 10 + 12 + 14
= 56
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Length of Triangles.
Answer:
9
Step-by-step explanation:
Since the scale factor is 12/8 = 1.5, to find LA we have to multiply FI by 1.5 which is 6 * 1.5 = 9.
Simplify ^36 - ^16 =
Answer:
[tex]x^{36}-x^{16}[/tex] is already at its simplest form
Step-by-step explanation:
You cannot factor or GCF anything out of it, and you cannot just subtract exponents. Therefore, it is simplified already.