6. The human resources manager of an international company specializing in the die-casting of high precision components has determined that the results of a shape perception test applied to operators in the plant are distributed according to a normal distribution with mean m = 90 and standard deviation s = 15.

A random sample of 25 operators was given the shape perception test.

What is the probability that the sample mean is between 88 and 94?

a) 0,6306

b) 0,0455

c) 0,9545

d) 0,3437

e) 0,6563

f) 0,3825