Answer:
answer 4 im pretty sure
Step-by-step explanation:
i did da math
Enter the absolute value of 6.2 and -7/2
Answer:
1, 6.2 and 7/2
Step-by-step explanation:
Answer:
6.2 = 6.2
-7/2= 3.5
Step-by-step explanation:
Because I know, mark brainliest please
A grading scale is set up for 1000 students' test scores. It assumes the
scores are normally distributed with a mean score of 75 and a standard
deviation of 15.
How many students will score between 48 and 75?
hint: recall how to get the standard deviation. What does that mean in
this context? How could you use that to understand how many test
scores could be in one standard deviation?
464
Answer:
464 students will score between 48 and 75. Using the z-distribution, we measure how many standard deviations each score is from the mean, then find the p-value associated with each score to find the proportion, and from the proportion, we find how many out of 1000.
Step-by-step explanation:
Normal Probability Distribution:
Problems of normal distributions can be solved using the z-score formula.
In a set with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the z-score of a measure X is given by:
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.
It assumes the scores are normally distributed with a mean score of 75 and a standard deviation of 15.
This means that [tex]\mu = 75, \sigma = 15[/tex]
How many students will score between 48 and 75?
First we find the proportion, which is the pvalue of Z when X = 75 subtracted by the pvalue of Z when X = 48. So
X = 75
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
[tex]Z = \frac{75 - 75}{15}[/tex]
[tex]Z = 0[/tex]
[tex]Z = 0[/tex] has a p-value of 0.5
X = 48
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
[tex]Z = \frac{48 - 75}{15}[/tex]
[tex]Z = -1.8[/tex]
[tex]Z = -1.8[/tex] has a p-value of 0.0359
1 - 0.0359 = 0.4641
Out of 1000:
0.4641*1000 = 464
464 students will score between 48 and 75. Using the z-distribution, we measure how many standard deviations each score is from the mean, then find the p-value associated with each score to find the proportion, and from the proportion, we find how many out of 1000.
what is 358 divided by 6
Answer:
59.6
Step-by-step explanation:
:)
Decimal form-59.6
Mixed fraction form-59 2/3
Exact form-179/3
In ancient Egypt, mathematicians and architects used 10 as an approximation for π . The circular floor of an ancient arena is paved with tiles. The floor of the arena has a radius of 100 feet.
Hey Some One Help With This Please
NO LINKS PLEASEEEEEE!
HELP!!
Answer:
option d will match friend
Two points are 17 units apart on a number line. The coordinate of one point is -20.
What are the possible coordinates of the other?
A. -3 and +3
B. -37 and +3
C. -37 and -3
D. +37 and +3
E. +37 and -3
please answer ive been waiting half hour
Every plant bloomed in the spring. The simple subject of this sentence is _____.
every
every plant
plant
bloomed
The subject is the idea,being or thing being discussed.
Should be "plant". Its the Main thing being discussed.
simple math for 18 points !!
Hi there!
[tex]\large\boxed{C. \text{ } \$ 272.50}[/tex]
To begin, we can find the amount he is paid from his hourly wage:
$12.75 × 6 = $76.5
Calculate the commission by adding up the sales to get the total:
$1200 + $2350 $975 + $375 = $4900
4% of $4900 = 4900 × 0.04 = 196
Add the total wage and commission together:
76.5 + 196 = $272.50
Answer:
c 272.50
Step-by-step explanation:
44%
Bill needs to build a rectangular sheep pen.
The pen must have a perimeter of 24 m.
Every half metres of fencing cost him £1.20.
a) Work out the cost of fencing used to make
the sheep pen.
The length of the sheep pen is three times its width.
b) Find the length and width of the sheep pen.
Length
metres
Width
metres
Answer:
£57.60
9m
3m
Step-by-step explanation:
cost of fencing = perimeter of the fence x cost of half meter x 2
1.2 x 2 x 24 = £57.60
Perimeter = 2 x ( length + width)
let x = width
length = 3x
2 x (3x + x) = 24
divide both sides of the equation by 2
4x = 12
x = 3
Length = 3 x 3 = 9m
Help me please! It’s math rewrite each expression as a single power. Whoever helps gets brainly and gives stars and does it right please.
Answer:
1. [tex]6^{8}[/tex]
2. [tex]5^{10}[/tex]
3. [tex]2^{9-5}[/tex]
4. [tex]3^{6}[/tex]
5. [tex]12^8[/tex]
6. [tex](7^2)^2[/tex]
Step-by-step explanation:
have a good day! :)
need help asappppppp
Answer:
for what
Step-by-step explanation:
[tex]s = 2\pi(r + h)[/tex]
find r
Can someone show me how to do this? You have to find the side length or angle measure.
Answer: Add the other two lengths together. 18plus21
Step-by-step explanation:
I need help ☹️ anybody know if it’s a b c or d
Answer:
C
Step-by-step explanation:
Identify the constant term of
14 - 8x - 7y
Answer:
14
Step-by-step explanation:
There are 60 teachers in the school. 40 of them are from Ireland. What fraction of teachers are from Ireland?
What is the degree of the equation?
What is the Leading Coefficient of the equation ?
Solve using the Quadratic Equation.
5X^2 – 3X – 8=0
Answer:
1 (give brainliest plss)
Step-by-step explanation:
Step-1 : Multiply the coefficient of the first term by the constant 5 • -8 = -40
Step-2 : Find two factors of -40 whose sum equals the coefficient of the middle term, which is -3 .
-40 + 1 = -39
-20 + 2 = -18
-10 + 4 = -6
-8 + 5 = -3 That's it
Step-3 : Rewrite the polynomial splitting the middle term using the two factors found in step 2 above, -8 and 5
5x2 - 8x + 5x - 8
Step-4 : Add up the first 2 terms, pulling out like factors :
x • (5x-8)
Add up the last 2 terms, pulling out common factors :
1 • (5x-8)
Step-5 : Add up the four terms of step 4 :
(x+1) • (5x-8)
Which is the desired factorization
[tex]\mathfrak{\huge{\orange{\underline{\underline{AnSwEr:-}}}}}[/tex]
Actually Welcome to the concept of Quadratic Equations.
Degree of a equation represents the highest power of the varible in the equation, For quadratic equation the degree is 2.
Leading Coefficient are the constant numbers that are significantly multiplied with the variables in the equation.
==> 5x^2 - 3x - 8 = 0
==> 5x^2 -8x +5x -8=0
==> x(5x-8) +1(5x-8)=0
==> (5x-8)(x+1) = 0
Please help marking people as brainlist
Question 5 of 10
Use the function below to find F(-4).
F(x) = 2x
O A. -16
B. -8
C.
1CO
1
O D.
Answer:
B. -8
Step-by-step explanation:
F(x) = 2x
F(-4) = 2(-4) = -8
2.52343454 + -34355343.99
NEED HELP PLZZZZZZ ASAP
Answer:
5555555555555555555555555555555555555 trust
Step-by-step explanation:
The local branch of the Internal Revenue Service spent an average of 21 minutes helping each of 10 people prepare their tax returns. The standard deviation was 5.6 minutes. A volunteer tax preparer spent an average of 27 minutes helping 14 people prepare their taxes. The standard deviation was 4.3 minutes. At α = 0.02, is there a difference in the average time spent by the two services? Find the 98% confidence interval for the two means.
a. State the hypotheses and identify the claim.
b. Find the critical value(s).
c. Compute the test value.
d. Make the decision.
Answer:
The confidence Interval is [- 0.7053 10.4521]
a: The hypotheses are
H0: μ1=μ2 against the claim Ha :μ1≠μ2
b. The critical value for t∝/2 for 17 d.f t > 2.508 and t < -2.111
c. t= -2.8422
d. The calculated value of t= -2.8422 is less than t < -2.11 the critical value therefore we reject H0 and conclude there is a difference between the two means.
Step-by-step explanation:
When the standard deviations are not the same then the confidence intervals for mean differences are calculated as
(x1`-x2`)- t∝/2 √s1²/n1 + s2²/n2 < u1-u2 < (x1`-x2`)+ t∝/2 √s1²/n1 + s2²/n2
x1`= 21 x2`= 27
n1= 10 n2= 14
s1= 5.6 s2= 4.3
The degrees of freedom is calculated using
υ = [s₁²/n1 + s₂²/n2]²/ (s₁²/n1 )²/ n1-1 + (s₂²/n2)²/n2-1
= 17
The t∝/2 for 17 d.f = 2.11
Putting the values
(x1`-x2`)- t∝/2 √s1²/n1 + s2²/n2 < u1-u2 < (x1`-x2`)+ t∝/2 √s1²/n1 + s2²/n2
(21-27) - 2.11√5.6²/10+ 4.3²/14 < u1-u2 <(21-27) +2.11√5.6²/10+4.3²/14
6- 2.11*2.111 < u1-u2 < ( 6 ) +2.11*2.111
6- 4.4521 < u1-u2 < ( 6 ) +5.294
- 1.5479 < u1-u2 < 10.4521
The confidence Interval is [- 0.7053 10.4521]
a: The hypotheses are
H0: μ1=μ2 against the claim Ha :μ1≠μ2
The claim is that there is a difference in the average time spent by the two services
b. The critical value for t∝/2 for 17 d.f t > 2.508 and t < -2.111
The degrees of freedom is calculated using
υ = [s₁²/n1 + s₂²/n2]²/ (s₁²/n1 )²/ n1-1 + (s₂²/n2)²/n2-1
= 17
c. The test statistic is
t= (x1`-x2`) /√s1²/n1 + s2²/n2
t= (21-27) /√5.6²/10+ 4.3²/14
t= -6/2.111
t= -2.8422
d. The calculated value of t= -2.8422 is less than t < -2.11 the critical value therefore we reject H0 and conclude there is a difference between the two means.
What is the mean of the data set?
25, 18, 16, 25
Answer:
21
Step-by-step explanation:
Add all of the numbers and then divide by how many numbers there are.
No links please need help
Answer:
19
Step-by-step explanation:
I put it in my calculator
Answer:
D. 19
hope this helps
have a good day :)
Step-by-step explanation:
help me please I dont know this
Answer:
answer: 384
Step-by-step explanation:
Hello! cubes are very simple! since there all the same measure and 6 faces all we have to do is 8 × 8 = 64 sense we know 1 face is 64 we just have to multiply by 6 cause there is 6 faces so
64 × 6 = 384 Hope this helps you!
100% = Ex Which expression is the same as multiply 3 and 2, add 5 to the product, then multiply by 10? A. (3 x 2) + 5 x 10 B. (3 x 2 x 10) + 5 O c. 3x (2 + 5) x 10 O D. (3 x 2 + 5) x 10
Answer:
this is the answer
A. (3 x 2) + 5 x 10
FREE POINT GIVE AWAY!!!!!! Just solve my equation 5*4+2=? (I already know the answer)
Answer:
22
Step-by-step explanation:
I did the math in my head sooo if it's wrong I know why
Mary is rolling a standard six-sided die and spinning on a spinner with the number 1-8.
A) Are her dice rolls and spinning outcomes independent or dependent? Explain why.
B) What is the probability of her rolling a 4 and spinning an 8? Show all work.
C) What is the probability of her rolling an even number and spinning a number less than 3? SHOW ALL WORK..
Answer:
a) Dice and spinner are different objects, with no relation between themselves, and thus her dice rolls and spinning outcomes are independent.
b) [tex]\frac{1}{48}[/tex] probability of her rolling a 4 and spinning an 8.
c) [tex]\frac{1}{8}[/tex] probability of her rolling an even number and spinning a number less than 3.
Step-by-step explanation:
A probability is the number of desired outcomes divided by the number of total outcomes.
A) Are her dice rolls and spinning outcomes independent or dependent?
Dice and spinner are different objects, with no relation between themselves, and thus her dice rolls and spinning outcomes are independent.
B) What is the probability of her rolling a 4 and spinning an 8?
Since the events are independent, we find each separate probability and multiply them.
Probability of rolling a 4:
One side out of 6 on the dice. So
[tex]P(A) = \frac{1}{6}[/tex]
Probability of spinning an 8:
One side out of 8 on the spinner. So
[tex]P(B) = \frac{1}{8}[/tex]
Probability of rolling a 4 and spinning an 8:
[tex]P(A \cap B) = P(A)P(B) = \frac{1}{6} \times \frac{1}{8} = \frac{1}{48}[/tex]
[tex]\frac{1}{48}[/tex] probability of her rolling a 4 and spinning an 8.
C) What is the probability of her rolling an even number and spinning a number less than 3?
Since the events are independent, we find each separate probability and multiply them.
Probability of rolling an even number:
2, 4 or 6(3 sides out of 6). So
[tex]P(A) = \frac{3}{6} = \frac{1}{2}[/tex]
Probability of spinning a number less than 3:
Two numbers(1 or 2) out of 8 on the spinner. So
[tex]P(B) = \frac{2}{8} = \frac{1}{4}[/tex]
Probability of rolling an even number and spinning a number less than 3:
[tex]P(A \cap B) = P(A)P(B) = \frac{1}{2} \times \frac{1}{4} = \frac{1}{8}[/tex]
[tex]\frac{1}{8}[/tex] probability of her rolling an even number and spinning a number less than 3.
HELP PLEASEEEEEEEEEEEEEEE
Answer:
Step-by-step explanation:
12²+15² is 369. square root of 369 is 3[tex]\s\sqrt{41[/tex] or 19.2
Give the coordinates of point A.
Answer: -2,-5
Step-by-step explanation:
The red point is located in the 3rd quadrant in the graph. So that means both the y and the x are negative. So first you go by the x value, the point is located on the 2 space left (-) from the origin (center) of the graph and then you have to go 5 spaced down (-). So point A is located at (-2,-5).