Question

The popping-times of the kernels in a certain brand of microwave popcorn are normally distributed with a mean of 150 seconds and a standard deviation of 10 seconds.

The first kernel pops 127 seconds after the microwave oven is started. What is the z-score of this kernel? Round your answer to two decimal places.
A. -2.30
B. -0.43
C. 2.30
D. 0.43

Answer 1

z-score formula:
z=(test value- mean) / standard deviation
z = (127 - 150)/10
z = - 2.30

Answer 2

i would put a

Answer 3

yayyy

Answer 4

do you get it

Answer 5

yes