Question

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?

Answer 1

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