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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

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the z score formula is \[z=\frac{ obsv - mean }{ std.dev. }\] i'll leave the computation to you. post your answers here.
what is obsv?
z=31-39/18.0 correct?

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Other answers:

z=100-39/18.0 = 3.4
z=31-39/18.0=.44
is this right so far?
there is a negative sign
I. z = -0.44 II. z = 3.4
okay so I was on the right track then just forgot the negative sign
just be careful with the signs.
Thank you so much for the help.

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