Mathematics High School

Use technology or a z-score table to answer the question.
The scores on a memory test are normally distributed with a mean of 100 and a standard deviation of 25. Consider a group of 400 people who take the test.

How many people will score 90 or less?

63

138

180

262

Answers

Answer 1

Answer:138

Step-by-step explanation:

I just took the test

Answer 2

The number of people who score 90 or less is 138, option B is correct.

What is Statistics?

Statistics is the discipline that concerns the collection, organization, analysis, interpretation, and presentation of data.

Let us find the proportion of people in the group of 400 who score 90 or less on the memory test.

Given that the scores are normally distributed with a mean of 100 and a standard deviation of 25.

Using a z-score table, we can find the z-score corresponding to a raw score of 90 as follows:

z = (90 - 100) / 25 = -0.4

The area under the standard normal distribution curve to the left of z = -0.4 is 0.3446, which represents the proportion of people who score 90 or less on the memory test.

Therefore, the number of people who will score 90 or less is:

0.3446 x 400 = 137.84

Hence, the number of people who score 90 or less is 138, option B is correct.

To learn more on Statistics click:

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#SPJ2

Related Questions

find total surface area of cylinder is R = 7 cm and H = 10 cm​

Answers

Step-by-step explanation:

Given radius , r = 7cm

and height , h = 10cm

Surface Area of Cylinder

[tex] = 2\pi {r}^{2} + 2\pi \: rh \\ = 2\pi( {7}^{2} ) + 2\pi(7)(10) \\ = 2\pi(49) + 2\pi(70) \\ = 98\pi + 140\pi \\ = 238\pi {cm}^{2} [/tex]

I will leave it in terms of pi as i am not sure how you want to leave your answer as.

Please solve no need for explanation

Answers

Answer:

Ermmm..

Step-by-step explanation:

We can find the natural first and find the Ineger

0 is a whole number
the square root of 2 is an irrational number
5.123456... is a rational number
3120 is a natural number
-6/7 is a rational number

what is the equation of the volume of a sphere

Answers

Answer:

[tex]\frac{4}{3} *\pi * r^{3}[/tex]

r is radius of the sphere

pls help im new to this and i could use a little help on this problem tysm if you do!!:)<33

Answers

Answer:

HOOO YOU SHOULD KNO THIS!!!

Step-by-step explanation:

Answer:

the answer is -2.

Step-by-step explanation:

trust me???

What is the length of X to Y
answers r

Answers

Answer:

8.6

Step-by-step explanation:

Acar traveled 50 miles in 40 minutes. Assume that the car will continue at this constant
rate of speed. Which equation would accurately give the total number of miles, M, for
any given number of hours, h?

Answers

Answer:

M = 75h

Step-by-step explanation: The way you get this answer is my dividing 50/40 = 1.25. then do 1.25x60 (1 hr because you have to continue to miles per hour) which gives 75H.

HELP I WILL GIVE BRIANLY
If 1/3 of my money is 80, what is 25% of my money?​

Answers

Answer:

60 = 25% of ur money

Step-by-step explanation:

80×3=100%of ur money (240)

to get 25% we need to divide 240 by 4 bcs 4= 25%

Школьник поднял гирю весом 16 кг на высоту 2,1 м за 2 с. Определите:
а) Механическую работу, выполненную школьником;
б) Механическую мощность, развитую им;
в) На сколько увеличилась при этом потенциальная энергия си-
стемы „гиря-земля". Считать g = 10 Н/кг.
ОЧЕНБ ОЧЕНЬ СРОЧЬНО НАДО. ПОМОГИТЕ ПОЖАЛУЙСТА ЩЯС.​

Answers

Answer:

what type of language is this isn't this India?

find the value for x

Answers

Answer:

X=22

Step-by-step explanation:

measurement of angle a is right angle

mA=4x+2

90=4x+2

4x=90-2

4x=88

4x/4=88/4

X=22

What is the volume of a sphere with a radius of 3 inches?
12 pi cubic inches
24 pi cubic inches
36 pi cubic inches
48 pi cubic inches

Answers

Answer:

36π cubic inches

Step-by-step explanation:

V = 4/3 πr³

radius (r): 3

= 4/3π(3)³

= 4/3π (27)

= 36π

What is 12,634 divided by 6

Answers

Answer:

439 :)

Step-by-step explanation:

12,634/6

439

Answer:

2105.66667 or 2105.67 :)

Step-by-step explanation:

hope this helps! have a great day!!

Find the area and thank

Answers

Answer:

add it

Step-by-step explanation:

Answer:

It’s 40

Step-by-step explanation:

Find the constant proportionality (r) using the value for r, enter an equation in the form of. C=rg that represents the relationship between the number of the gallons of gasoline used (g) and the total cost(c)

Answers

Answer:

3.333

C = 3.3333g

Step-by-step explanation:

Given the relation : C = rg

C = Total cost of gasoline

g = Number of gallons of gasoline used

r = constant of proportionality

Picking any point on the graph :

At cost, c = $30

Number of gallons of gasoline used, g = 9

Putting the values into our equation :

C = rg

$30 = r * 9

30 = 9r

Divide both sides by 9

30/9 = 9r / 9

3.333 = r

Hence, constant of proportionality, r = 3.333

Help please *no links*

Answers

Answer in photo below
42, 24, 48

PLEASE HELP PLEASE ASAP​

Answers

Step-by-step explanation:

Range = Largest number in list - Smallest Number in list

[tex] = 7 - ( - 3) \\ = 7 + 3 \\ = 10[/tex]

Answer:

10

Step-by-step explanation:

7 - (- 3) =

7 + 3 =

10

Solve using substitution. y = 5 7x - 8y = -12​

Answers

Step-by-step explanation:

y=57x-8y=-12

so we put the Y

y=-12

-12=57x-8y

57x-8x(-12)=-12

(-36/19,-12)<---- answer

In this problem a,b,c and d are nonzero integers. If a/b is added to x, the sum is c/d. Which statement can be used to prove that x must be a rational number.

A= x=cb-ad/bd B= x=cb+ad/bd C= x=c-a/d-b D= x= c+a/d-b

Answers

Answer:

x=cb-ad/bd

Step-by-step explanation:

The statement which can be used to prove that x must be a rational number is x = (cb - ad) / bd

Prove of rational number

Given nonzero integers:

a, b, c, d

If a/b is added to x

a/b + x

the sum is c/d

a/b + x = c/d

prove x to be a rational number

a/b + x = c/d

subtract a/b from both sides

a/b + x - a/b = c/d - a/b

x = c/d - a/b

x = (cb - ad) / bd

Therefore, the statement which can be used to prove that x must be a rational number is x = (cb - ad) / bd

Learn more about rational number:

https://brainly.com/question/12088221

what is the measure of angle 1 ? pls i need help ​

Answers

This is a chord, chord angle problem.

Angle 1 = (50 + 56)/2. This leads to 53 degrees.

Answer:

58

Step-by-step explanation:

(50 + 56)/2 = 116/2 = 58

Can yall help me need help ASAP​

Answers

Answer:

18+2x>_0

18/2 + 2x/2

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Step-by-step explanation:

first take the 2x to the other side which will automatically change from - to + and then divide both 18 and 2x by 2

Factor out the greatest common factor. If the greatest common factor is 1, just retype the polynomial.

24f2+11

Answers

Answer:

24t^2 + 11

Step-by-step explanation:

There is a lot left out of this question. If you are allowed rational numbers, a common factor could be 24.

24(t^2 + 11/24) is one possibility.

I think what you mean is there an integer that is a common factor. There is not.

So the answer is 24t^2 + 11

There is one more thing that needs to be clarified. Can you give t a value? If you can, then t = 11

the common factor would be

11(24 * 11 + 1)

I doubt very much that this is what is meant, but the question really should make it clear.

Answer:

1(24f²+11) is your answer

Step-by-step explanation:

24f2+11

taking common

1(24f²+11)

Gary is a regular customer at a coffee shop. The probablity that Gary orders a bagel is 85% . If Gary goes to the coffee shop 500 times, which is the best estimate for the number of times Gary will NOT order a bagel?

Answers

The answer will be 425................

The next model of a sports car will cost 5.6% less than the current model. The current model costs $52,000. How much will the price decrease in dollars? What
will be the price of the next model?

Answers

Answer:

49,088

Step-by-step explanation:

First you need to find 5.6% of 52,000. Simply multiply 52,000 by 0.056 (change the percent to a decimal) then you get 2,912.

Second, you need to subtract 2,912 from 52,000 which is 49,088

Fill in the Blank, I just need help with the last blank

Answers

Given:

A circle with center O, LN and MP are two diameters.

To find:

The minor arcs of the given circle.

Solution:

If any arc of a circle is less than its semicircle, then the arc is called is minor arc.

Since LN and MP are two diameters, therefore they divide the circle is two equal parts. So, the arc LN and arc MP are semicircles.

If arc LN and arc MP are the semicircles, then arc LM, arc MN, arc PL and arc NP are less than the semicircle.

So, arc LM, arc MN, arc PL and arc NP are minor arcs.

Therefore, the correct option is A.

The cost to make x T-shirts can be represented by the function C(x).
Complete the statement below about function C.

If C(10) = 50, then____ T-shirts cost $_____.

Answers

Answer:

$5

Step-by-step explanation:

Answer:

if c(10)=50, then 10 T-shirta cost $50

Help me ASAP!!!!!!!

See pic attached

friend request me and I'll accept thanks xx

Answers

Step-by-step explanation:

cosA=b/h

cos41°=y/30

0.754=y/30

y=0.754×30

y=22.64

Answer:

y = x + 4

-3x + y = 2

x = -2y - 2

Step-by-step explanation:

Which is equivalent to 3/84 ?
VEA *
+/W
78%
1/8*
3
4x

Answers

The third one it could be one.

What is (-3, -2) reflected over the y-axis

Answers

Answer:

3,-2

Step-by-step explanation:

Answer:

(3, -2)

Step-by-step explanation:

[Cartesian plane]

______________

+y

↑

-x ← — | — → +x

(-3,-2) |

↓

-y

______________

[Flipping over the y axis]

-The reflection will be the-

same distance from the y axis

+y

↑

-x ← — | — → +x

(-3,-2) → | → (3, -2)

↓

-y

At the talent show, dancers outnumber singers by a ratio of 13 to 7 If there are 52 dancers at the talent show, how many singers are at the talent show?​

Answers

Answer:32

Step-by-step explanation: 52-20

Natasha runs all the way around the edge of her backyard. Her back-yard is 11 feet wide and 15 feet long. How far does Natasha run?

Answers

Answer:

The answer is 52

Step-by-step explanation:

This problem is perimeter so you add 11 plus 11 plus 15 plus 15 to get 52.

What is the sum of the interior angles of the polygon pictured below?

Answers

Answer:

37

Step-by-step explanation: IM MAKING A GUESS IF ITS WRONG IM SORRY  I TIRED

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