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 13 seconds.
The first kernel pops 128 seconds after the microwave oven is started. What is the z-score of this kernel. round to 2 decimal places.

Answer 1

z-score = (given data value - mean)/standard deviation

Answer 2

so (128-150)/13

Answer 3

yup!

Answer 4

i get -1.69

Answer 5

ish

Answer 6

good!

Answer 7

yayy