A group of students at a school takes a history test. The distribution is normal with a mean of 25, and a standard deviation of

Question

3 years ago

6

A group of students at a school takes a history test. The distribution is normal with a mean of 25, and a standard deviation of

4. (a)Everyone who scores in the top 30% of the distribution gets a certificate. What is the lowest score someone can get and still earn a certificate?

Mathematics

1 answer:

Anna [14] · Answer 1 · 2022-03-05T03:59:24+03:00

Anna [14]3 years ago

8 0

Answer:

27.1

Step-by-step explanation:

Given:

mean=25

standard deviation=4

z0.70=0.525

$z=\frac{x-mean}{standard deviation}$

z*sd = x-mean= 2.1

the lowest score for the top 30%: x=27.1