Mathematics High School

Scores on a national math test are Normally distributed, with a mean score of 490 and a standard deviation of 50. Which test score represents the top 20%, rounded to the nearest whole number?

Find the z-table here.

426
448
532
554

Answers

Answer 1

Answer:

532

Step-by-step explanation:

The score that represents the top 20% = A score = 80%

Z score for 80% percentile = 0.842

We solve using the z score formula

z = (x-μ)/σ, where

x is the raw score = ??

μ is the population mean = 490

and σ is the population standard deviation = 50

Hence:

0.842 = x - 490/50

Cross Multiply

0.842 × 50 = x - 490

x = 0.842 × 50 + 490

x = 42.1 + 490

x = 532.1

Approximately = 532

Therefore, the test score = 532

Answer 2

Answer:

532

Step-by-step explanation:

edg 2020-2021

Related Questions

please help me!

The tape diagram represents an equation.
Write an equation to represent the image

Answers

i’ve never done a tape diagram before (so this might be wrong). But I think it’s:

6t=9

If this is correct, I hope it helps :)

Answer:

1.5 x 6 = 9

Step-by-step explanation:

9/6 because 6 t's and then we get 1.5 and so we multiply that by 6 and get 9

Find m<1
A.16
B.76
C.96
D.106

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106 is the answer hope it really helps yhu

GH∥IK. Find GK. I need help with this please

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Answer:

Step-by-step explanation:

Solve x2 – 4х + 1 = 0.
x 2 + 215
оооо
х = 4 + 3
0 х 2 + 3
x = -2 + 3

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Answer:

Use photo math, it will explain all the steps

Trig Ratios see attachment

Answers

Answer:

TanA = 5/12, SinA = 5/13

Step-by-step explanation:

Tangent is opposite/adjacent, so 5/12

Sin is opposite/hypotenuse, so 5/13

Hopefully this helps! Let me know if you have any questions

I need answers!!!!!!!!!

Answers

the answer is the last option!!

Answer:

Reflection figure Q was flipped over the y-axis, the line of reflection.

Step-by-step explanation:

The figures have the same lengths but they are reflected.

Hope this helps! :)

which method between graph method and table method friendly use? Motivate your answer

Answers

Answer:

in my experience table method is friendly use because it is easier to work with than a graph

Graph is good for seeing the overall trend/pattern in your data

Table is good for knowing the specific numerics

Each has its pros and cons so use it based on your needs

How to find a function value

Answers

Answer:

To find function values is the process of evaluating the function for given values of x. Example #1 If f (x) = x 2 + 4x + 3, find function values f (0), f (-2), and f (3). f (0) = 0 2 + 4 (0) + 3

Step-by-step explanation:

A reflection is a flip over the

Y-axis

Line of reflection

X-axis

Answers

Answer

LINE OF REFLECTION

Step-by-step explanation:

In geometry, reflection basically just means flipping things over a line.

two functions, A and B , are described as followed

Answers

Answer:

it was never followed by the description

Step-by-step explanation:

A school band gives a year-end concert. It is held in a 400-seat auditorium. Each concert ticket sells for $10, and 85% of the tickets are sold. How much money does the band earn from the sale of the tickets?

Answers

Answer: $3,400

Step-by-step explanation:

There are 400 seats in the auditorium which means that there are 400 tickets to be sold.

85% of these tickets are sold. The number of tickets sold is:

= 85% * 400

= 340 tickets were sold.

Each ticket sells for a total of $10.

The amount of money made from ticket sales is therefore:

= No. of tickets sold * price of ticket

= 340 * 10

= $3,400

only need help on 10!

Answers

Answer:

median 6.5

mean 6.166

range 6

Step-by-step explanation:

UGHH HELP ME PLSSS FOR EXTRA POINTS AND BRAINLEST

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Answer:

4410

Step-by-step explanation:

im pretty sure its B. 4,410 !

which of the three curves drawn matches the graph of y = 2x 2 + x?

Answers

Answer:

y= 0 1 2 3 4

Step-by-step explanation:

just minus 2 by all of the numbers from x

1 less than the square of a number.

Answers

Answer:

x^2-1

Step-by-step explanation:

I hope this helps.

A grocery store clerk put only packages of flour tortillas and packages of corn tortillas on the shelf. The ratio of the number of packages of corn tortillas to the total number of packages on the shelf was 7 to 16.
Which number could be the number of packages of flour tortillas the clerk put on the shelf?

Answers

Answer:

Step-by-step explanation:

Answer: 18 and 32

Step-by-step explanation: If there is a total pf 16 package and 7 of them are corn tortillas than the number of flour tortillas are 9. If it is 9 then only variables of nine could be the answer.

hi please help i’ll give brainliest please

Answers

Answer:

its c

Step-by-step explanation:

Answer:

28y + 63 (second option)

Step-by-step explanation:

7(4y + 9)

7 x 4y (28y)

7 x 9 (63)

you would multiply 7 and 4y to get 28y and then multiply 7 and 9 to get 63 and you would add the plus sign to get the full answer which is 28y+63

PLEASE HELP!! DUE SOON

The three side lengths of a triangle are given. Which triangle is a right triangle?

Answers

Answer: Triangle 1

Step-by-step explanation: Right triangles follow the pythagorean theorem, so does triangle 1. root 13 squared + 6 squared is 49, as is 7 squared

your gym membership cost $33 per month after an initial membership fee. you paid a total of $228 after 6 months. writer an equation that gives the cost as a function of the length of your gym membership (in months). find the total cost after 9 months

Answers

Answer:

what i did was multiply 33*6 and got 198 and then 228-198 to find out that the initial fee was 30 dollars. then multiply 33*9+30 to get a 9-month total cost of $327

Step-by-step explanation:

cost = $33 per month + fee

1. c(m) = 33m + f

33(6) + f = 228

198 + f = 228

f = $30 membership fee

c(m) = 33m + 30

2. at 9 months: 33(9) + 30 = $327

hopefully this helps :)

have a nice day !!

brianlist anyone?!?!?!

Answers

Answer:

its the third one

Step-by-step explanation:

Answer:

C. Y-6= 3/4 (x+4)

Step-by-step explanation:

1. Anthony threw a ball from the top of a 10-story building that was 165 feet

tall. The equation g(165 - h) = v2 can be used to find the maximum

height the ball can attain after being thrown from the top of the building,

Rewrite the equation to highlight the maximum height attained by the

ball, h.

Answers

Answer:

[tex]h = 165 - \frac{v^2}{g}[/tex]

Step-by-step explanation:

Given

[tex]g(165 - h) = v^2[/tex]

Required

Make h the subject

[tex]g(165 - h) = v^2[/tex]

Divide both sides by g

[tex]165 - h = \frac{v^2}{g}[/tex]

Subtract 165 from both sides

[tex]165 - 165 - h = \frac{v^2}{g} - 165[/tex]

[tex]- h = \frac{v^2}{g} - 165[/tex]

Multiply both sides by -1

[tex]-1 * - h = (\frac{v^2}{g} - 165)*-1[/tex]

[tex]h = 165 - \frac{v^2}{g}[/tex]

What is the distance between points (-3,2) and (-9,2) on the coordinate plane?

Answers

Answer:

distance is 6

Step-by-step explanation:

Mark works at Target. He works 4 hours a day for a total of 120 days of the year. His hourly rate of pay is $12.50 . How much can he expect to make annually prior to deductions?

Answers

Answer:

$6000

Step-by-step explanation:

annual income = total hours worked x hourly rate

total hours worked = total hours worked per day x total days worked in a year

120 x 4 = 480

480 x 12.50 = $6000

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Answers

Answer:

Its B I am sure I have answered this and got it correct

Please help me.. I’m not really good at math so please??

Answers

what’s the question

this is standard form (9x10 to the power of -4) to the power of 2

Answers

Answer:

9×10 to the power of -8

Step-by-step explanation:

Cause when we add power to the power we multiply them

For example [tex](2^{2} )^2[/tex] , we multiply the power so , 2×2= 4 so [tex](2^{2} )^2[/tex] = [tex]2^{4}[/tex]=16

Same here [tex]((9*10)^{-4} )^2[/tex] we multiply the powers so -4×2=-8

So [tex]((9*10)^{-4} )^2[/tex] =[tex](9*10)^{-8}[/tex] = 2.323×[tex]10^{-16}[/tex]

9x10 to power of -8
Good luck

Marcos makes a table to show how many students in his class wear glasses. There are 18 boys and 14 girls in the class. There are 5 boys and 7 girls who wear glasses. Which table correctly shows the data?

Answers

Answer:

wheres the tables at

Step-by-step explanation:

Answer:

A just took the test.

Step-by-step explanation:

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Answer:

Step-by-step explanation:

At 100°F, a certain Insect chirps at a rate of 97 times per minute, and at 102°F, they chirp 111 times per minute. Write an equation in slope-intercept form that represents the situation.

Answers

Answer:

y = 7x - 603

Step-by-step explanation:

We start by determining the slope:

m = y2 - y1/x2 - x1 = 111 - 97/102 - 100 = 14/2 = 7,

Now we substitute the slope into the slope-intercept equation y = mx + b, solving for the y-intercept [b]:

111 = 7(102) + b,

b = -603

Equation: y = 7x - 603

How many triangles can a polygon with 32 sides be sectioned into?

Answers

32 sides of a polygon has 20 triangles.

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Scores on a national math test are Normally distributed, with a mean score of 490 and a standard deviation of 50. Which test score represents the top 20%, rounded to the nearest whole number? Find the z-table here. 426 448 532 554

Answers

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Scores on a national math test are Normally distributed, with a mean score of 490 and a standard deviation of 50. Which test score represents the top 20%, rounded to the nearest whole number?

Find the z-table here.

426
448
532
554