Question

Need some help deciding this answer... Can't figure it out

Answer 1

A school requires an entrance exam score that is in the top 3% of the population in order to be accepted. If an entrance exam has a mean of 500 and a standard deviation of 55, what is the minimum qualifying score to be accepted at the school?

Answer 2

396.05

396.60

603.40

603.95

These are my choices... Is it 369.60 or 603.40?

Answer 3

@Euler271

Answer 4

@Luciantt ? o.o

Answer 5

it's not 396.60 so it must've been the other.

Answer 6

OK this definitely has to do with Statistic and probability.So base on the formula which is
Population mean = μ = ΣX / N OR Sample mean = x = Σx / n

Answer 7

example:

Problem 1

A national achievement test is administered annually to 3rd graders. The test has a mean score of 100 and a standard deviation of 15. If Jane's z-score is 1.20, what was her score on the test?

(A) 82
(B) 88
(C) 100
(D) 112
(E) 118

Solution

The correct answer is (E). From the z-score equation, we know

z = (X - μ) / σ

where z is the z-score, X is the value of the element, μ is the mean of the population, and σ is the standard deviation.

Solving for Jane's test score (X), we get

X = ( z * σ) + 100 = ( 1.20 * 15) + 100 = 18 + 100 = 118

Answer 8

using this sample you should be able to fine the result.

Answer 9

a car is designed to last an average of 12 years with a standard deviation of 0.8 years. what is the probability that the car will last less than 10 years. (a) .621% (b) 6.21 (c) 93.79% (d) 93.379%

Answer 10

can anyone help me with the car question????? PLEASE !!!!!