Ask question

Ask question

All categories

3 years ago

13

The mean on a standardized test is 100 and the standard deviation is 35. Your score is 65. What percentage of the scores were hi

gher than yours?

1 answer:

Helen [10]3 years ago

6 0

Answer:

84.13%

Step-by-step explanation:

Given data:

mean μ= 100 and standard deviation= 35

P(x>65)= $P(z>\frac{\mu-\sigma}{\sigma})$

putting vales we get

P(z>(65-100)/35)=P(z>-1) or P(z<1).,

from normal distribution table we get

P(z<1)= 0.8413= 84.13%

You might be interested in

Sadie is going to a carnival that has games and rides. Each game costs $1 and each ride costs $3.50. Sadie spent $28.50 altogeth

olchik [2.2K]

Answer:

Aria played 2 games and went on 7 rides.

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers

A universal set U consists of elements. If sets A, B, and C are proper subsets of U and n(U), n(A B)n(A C)n(B C), n(A

iragen [17]

Answer:

$n(A\ u\ B) = 10$

$n(A'\ u\ C) = 10$

$n(A\ n\ B)' = 6$

Step-by-step explanation:

Given

$n(U) = 12$

$n(A\ n\ B) =n(A\ n\ C) = n(B\ n\ C) =6$

$n(A\ n\ B\ n\ C)=4$

$n(A\ u\ B\ u\ C)=10$

Required

Solve a, b and c

There are several ways to solve this; the best is by using Venn diagram (see attachment for diagram)

Solving (a):

$n(A\ u\ B)$

This is calculated as:

$n(A\ u\ B) = n(A) + n(B) - n(A\ n\ B)$

From the attachment

$n(A) = 0+2+4+2 = 8$

$n(B) = 0+2+4+2 = 8$

$n(A\ n\ B) = 4 +2 = 6$

So:

$n(A\ u\ B) = 8 + 8 - 6$

$n(A\ u\ B) = 10$

Solving (b):

$n(A'\ u\ C)$

This is calculated as:

$n(A'\ u\ C) = n(A') + n(C) -n(A'\ n\ C)$

From the attachment

$n(A) = n(U) - n(A) = 12 - 8 = 4$

$n(C) = 0+2+4+2 = 8$

$n(A'\ n\ C) = 2$

So:

$n(A'\ u\ C) = 4 + 8 - 2$

$n(A'\ u\ C) = 10$

Solving (c):

$n(A\ n\ B)'$

This is calculated as:

$n(A\ n\ B)' = n(U) - n(A\ n\ B)$

$n(A\ n\ B)' = 12- 6$

$n(A\ n\ B)' = 6$

3 0

3 years ago

Evaluate 15/r -1 when r = 5

Juli2301 [7.4K]

$\frac{15}{r}-1=\frac{15}{5}-1=3-1=2$

2)
$\frac{15}{r-1}=\frac{15}{5-1}=\frac{15}{4}=3\frac{3}{4}=3.75$

4 0

3 years ago

Read 2 more answers

There are two bookcases against a wall. If one takes up 4/7 of the wall and the other takes up 2/8 of the wall, how much of the

Airida [17]

23/28 of the wall is covered by bookcases

3 0

4 years ago

Laura buys an unfair coin online. The coin is supposed to land heads up 75% of the time. If this is true, what is the

Archy [21]

Answer:

C . (0.75) 15 x (0.25) 5

Step-by-step explanation:

Took the assignment in edge, it’s right

Its based off of the rule P(A and B) = P(A) x P(B) from multiplication rule for independent events.

4 0

3 years ago