Question

A Math test has a mean of 39 and standard deviation of 18.0. Find the corresponding z scores for:

I. a test score of 31
II. a test score of 100

Please show all of your work

Answer 1

the z score formula is \[z=\frac{ obsv - mean }{ std.dev. }\] i'll leave the computation to you. post your answers here.

Answer 2

what is obsv?

Answer 3

z=31-39/18.0 correct?

Answer 4

z=100-39/18.0 = 3.4

Answer 5

z=31-39/18.0=.44

Answer 6

is this right so far?

Answer 7

there is a negative sign

Answer 8

I. z = -0.44
II. z = 3.4

Answer 9

okay so I was on the right track then just forgot the negative sign

Answer 10

just be careful with the signs.

Answer 11

Thank you so much for the help.