Question

The time required to finish a test is normally distributed with a mean of 60 minutes and a standard deviation of 10 minutes. What is the z-Score for a student who finishes the test in 45 minutes?

Answer 1

theres a nice compact formula for this\[z=\frac{x-mean}{sd}\]

Answer 2

still confused.

Answer 3

well, they are asking for z, they give you x, mean, and sd .... the rest us just plugging in the specifics for x, mean, and sd

Answer 4

sd is standard deviation or student?

Answer 5

standard deviation

Answer 6

so it would be x-60/10?

Answer 7

(x-60)/10 yes, now fill in for x

Answer 8

45-60/10?

Answer 9

correct

Answer 10

ok so -15/10 = -1.5?

Answer 11

thatll do it

Answer 12

thanks so much!

Answer 13

youre welcome