Question 1199277
standard deviation = 5.7
value of 125.2 has a z-score of 2.3
z-score formula is z = (x-m)/s
z is the z-score
x is the raw score
m is the mean
s is the standard deviation


when z = 2.3 and s = 5.7 and x = 125.2, z-score formula becomes:
2.3 = (125.2 - m) / 5.7
multiply both sides of the equation by 5.7 to get:
2.3 * 5.7 = 125.2 - m
add m to both sides of the equatio0n and subtract 2.3 * 5.7 from both sides of the equation to get:
m = 125.2 - 2.3 * 5.7 = 112.09
that's your mean