Aset of data that is normally distributed has a mean of 35.6 and standard deviation of 2.5. which number is between 1 and 2 standard deviations of the mean?

A set of data that is normally distributed has a mean of 35.6 and a Standard deviation of 2.5. Which # is between 1 & 2 standard deviation of the mean. 
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Find the x-values that correspond to z = 1 and z = 2 using x = zs+u
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For z = 1: x = 1*2.5+35.6 = 38.1
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For z = 2: x = 2*2.5+35.6 = 40.6

An x-value in between would be 39

What are 5e numbers?