Question 964865
z = (x-m)/s


x is the raw score 
m is the mean
s is the standard deviation.


in your problem:


m is 2.76
s is .64
z is 1.5


plug those values into the formula and you get:


z = (x-m)/s becomes:


1.5 = (x-2.76)/.64


solve for x to get:


x = .64 * 1.5 + 2.76 which becomes:


x = 3.72