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?

27.1

Step-by-step explanation:

Given:

mean=25

standard deviation=4

z0.70=0.525

z*sd = x-mean= 2.1

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

answer: 1 + 1 = 11

step-by-step explanation:

to determine the unit cost your would divide the total cost by the number sold.

7 bagels for $4.41       $4.41/7 = $.63 each at fresh side

5 bagels for $3.60         $3.60/5 = $.72 each at value mart