Answer:
A score of 150.25 is necessary to reach the 75th percentile.
Step-by-step explanation:
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 zscore 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 pvalue, we get the probability that the value of the measure is greater than X.
A set of test scores is normally distributed with a mean of 130 and a standard deviation of 30.
This means that [tex]\mu = 130, \sigma = 30[/tex]
What score is necessary to reach the 75th percentile?
This is X when Z has a pvalue of 0.75, so X when Z = 0.675.
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
[tex]0.675 = \frac{X - 130}{30}[/tex]
[tex]X - 130 = 0.675*30[/tex]
[tex]X = 150.25[/tex]
A score of 150.25 is necessary to reach the 75th percentile.
71 dvided by 50 in decimals
Answer:
1.42
hope this helps
have a good day :)
Step-by-step explanation:
Answer:
1.42
Step-by-step explanation:
HELP I REALLY NEED IT!
Answer:
mABC=253
mACB=311
Step-by-step explanation:
The big angle is 204
Everyone at Ethan's school wore either brown or yellow for school spirit day. 74 out of the 100 students at the school wore brown. What percentage of the students wore brown?
Answer:
It would be 74% out of 100%
Step-by-step explanation:
what is the probability of rolling a die and having it land on a factor of 30?
Using the probability concept, it is found that there is a 0.8333 = 83.33% probability of rolling a die and having it land on a factor of 30.
What is a probability?A probability is given by the number of desired outcomes divided by the number of total outcomes.In this problem, the outcomes are:
In total, there are 6 possible outcomes for the dice, which are the numbers from 1 to 6.Of those outcomes, 5 of them, 1, 2, 3, 5 and 6, are factors of 30, as the division of 30 by these numbers result in a remainder of 0.Hence:
[tex]p = \frac{5}{6} = 0.8333[/tex]
0.8333 = 83.33% probability of rolling a die and having it land on a factor of 30.
You can learn more about the probability concept at https://brainly.com/question/15536019
identify characteristics of the quadratic function and its graph
Answer:
Step-by-step explanation:
Vertex (1,-1)
Axis of symmetry: x = 1
Domain is the set of real numbers.
Range in interval notation: [-1,+∞)
When x< 1, y increases as x increases.
When x>1, y decreases as x increases.
M<2 if m<6=120
A 120
B 60
C 90
D 150
Answer:
a
Step-by-step explanation:
the angles 2 and 6 are corresponding meaning that they have the same value.
cos ( sin ^1 16\20) ??
help
Answer:
[tex]cos(sin^{-1} (\frac{16}{20} )[/tex] = 0.60
Step-by-step explanation:
Explanation
Given that the trigonometric function
[tex]cos(sin^{-1} (\frac{16}{20} )[/tex]
= [tex]cos(sin^{-1} (0.8 )[/tex]
= [tex]cos(53.13010)[/tex]
= 0.60
help me pls I need answers right now
Which graph represents an exponential function?
Answer:
(You never showed the graphs we were suppose to choose from)
The graphs of all exponential functions have these characteristics. They all contain the point (0, 1), because a0 = 1. The x-axis is always an asymptote. They are decreasing if 0 < a < 1, and increasing if 1 < a.
Make x the subject: Q/P-x=R
Step-by-step explanation:
Given
Q/P - x = R
Q = R( P - x)
Q/R = P - x
X = P - Q /R
Hope it will help :)
which trinomial(s) can be factored as (x + p)(a +9), where p and q are positive?
x^2 - x - 6
x^2 + x - 6
x^2 - x + 6
x^2 + 5x +6
x^2 - 5x +6
x^2 - 5x -6
Answer:
D. x² + 5x + 6Step-by-step explanation:
Trinomials can be factored as (x + p)(x + q), where both p and q are positive,
when both b and c are positive in:
ax² + bx + cOne option is correct:
x² + 5x + 6Here is a list of numbers.
3 1 8 7 6 5 1
Work out
a the median
the range
I mean find A the median and The range
Which Which expression is equivalent to the 1 below
Answer:
B
Step-by-step explanation:
(2^6*9^6):18^14
18^6:18^14
18^-8
1:18^8
plz help me thank you
Answer:
He added 7.5 instead of subtracting
Step-by-step explanation:
i will mark right answer branliest and report all wrong!!!
find for x
Answer:
120°
Step-by-step explanation:
The angle next to the x will be 40° due to the alternate angles so
x + 40° + 20° = 180° { being linear pair }
x + 60° = 180°
x = 180° - 60°
x = 120 °
Hope it will help :)
Answer:
120˚
Step-by-step explanation:
Since the two lines are parallel, they are alternate angles
So that means that the angle next to x must be 40˚
So 40 + 20 + x = 180 (since it's half a circle)
60 + x = 180
x = 120
not sure need help please
Answer:
it should be A. because the lead broke her arm immediately. causing her to spike her preformances
Step-by-step explanation:
Answer:
A.
Step-by-step explanation:
Because it shows that after the 1st week, into the 2nd week, it shows an increase of 9 performances.
Pls help with math ASAP
Tom buys a torch and a battery.
The torch costs eight times as much as the battery.
Tom pays with a £5 note and gets £1.49 change.
How much does the battery cost?
Answer:
battery costs: 0.39...............
Answer:
£0.39
Step-by-step explanation:
I did Question ON MATHSWATCH
A store is selling a pair of boots for $45.00 is making a 30% profit at this.price. How much did the boots originally cost?
Answer:
$31.50 profit
Step-by-step explanation:
By subtracting 30% of 45 from 45, we are left with $31.50.
Answer:
$31.50 profit
Step-by-step explanation:
By subtracting 30% of 45 from 45, we are left with $31.50.
Evaluate the indefinite integral. (Use C for the constant of integration.) sin(10x) 1 cos2(10x) dx
Answer:
The result of the integral is [tex]-\frac{\cos^3{10x}}{30} + C[/tex]
Step-by-step explanation:
We are given the following integral:
[tex]\int \sin{(10x)}\cos^{2}{(10x)} dx[/tex]
I am going to solve by substitution, using [tex]u = \cos{10x}[/tex], so [tex]du = -10\sin{10x}dx, dx = -\frac{du}{10\sin{10x}}[/tex]. So, we have
[tex]-\frac{1}{10} \int u^2 du[/tex]
Which has the following result:
[tex]-\frac{u^3}{30} + C[/tex]
Going back to x, the result of the integral is
[tex]-\frac{\cos^3{10x}}{30} + C[/tex]
. For every 5 students at Raymond Middle School, 3 students are in band, and
2 students are in sports. What part of the student population is in band?
Answer:
10 I believe
Step-by-step explanation:
What function is the inverse of the exponential function y = 4^x?
The function that is the inverse of the exponential function y = 4^x is lnx/ln4
Exponential functionsThe standard exponential function is given as y = ab^x
Given the function
y = 4^x
Replace y with x
x = 4^y
Make y the subject of the formula
lnx = ln4^y
lnx = yln4
Divide both sides by ln4
lnx/ln4 = y
Hence the function that is the inverse of the exponential function y = 4^x is lnx/ln4
Learn more on inverse function here: https://brainly.com/question/2873333
#SPJ2
5x + 7y = 3
2x + 3y = 1
Solve
Answer: x=2 and y=−1
Step-by-step explanation:
5x+7y=3for x:
5x+7y=3
5x+7y+−7y=3+−7y(Add -7y to both sides)
5x=−7y+3
x= −7/ 5 y+ 3 /5
Substitute −7 /5 y+ 3 /5 for x in2x+3y=1:
2( −7/ 5 y+ 3 /5 )+3y=1
1 /5 y+ 6 /5 =1(Simplify both sides of the equation)
1 /5 y= −1 /5
y=1
Substitute −1 for y in x
−7 /5 y+ 3 /5 : x=
x=2
x=2(Simplify both sides of the equation)
do
5cm
5cm
15 cm
form a triangle?
Answer:
No
Step-by-step explanation:
No, 5cm, 5cm, and 15cm cannot create a triangle because the side lengths do not follow the formula a + b > c. Since 5 + 5 = 10, and 10 is not greater than 15, these side lengths won't be able to form a triangle.
Hope this helps!!
Brad buys a sandwich. The regular cost is $6. He uses a coupon for 10% off. After that deduction, a sales tax of 5% is added. How much money Brad need to pay for the sandwich?
A. $5.10
B. $5.67
C. $5.94
D. $6.93
help please geometry
Answer:
1st option is correct (The diagonals are perpendicular)
NAME
DATE
Write the letter for the correct answer in the blank at the right of each question.
1. Use the Distributive Property to write 2(-5 + 3) as an equivalent expression.
What is the value of the expression?
A. 2(8); 16
C. 2(-5) + 2(3); -4
B. 2(-5) + 3; 13
D. (5 + 3)2; 16
2. Add (-x + 4) + (3x + 2).
Answer:
Option C - 2(-5)+2(3) ; -4
Step-by-step explanation:
Distributive property means breaking up the factors and multiplying them separately
So here we have 2(-5+3) = 2(-5)+2(3) = (-10)+(6) = (-4)
So (-4) is the value.
Hope this helps you.
Please help ASAP! answer as mush as you want but I need the answers! Thanks have a great and blessed day!!
Answer:
2 is b 3 is a 4 is b
Step-by-step explanation:
What is the measure of angle b?
Answer:
44 degrees
Step-by-step explanation:
The sum of all the angles in a triangle is 180 degrees!
You are given the two angles in the diagram, 46 and 90
Here's the equation I used to solve it!
180 = 46 + 90 + x
1. 180 = 136 + x
2. 180 - 136 = x
4. x = 44
Use the Figure below to find the value of x
Answer:
It should be 92
Step-by-step explanation: