In a manufacturing process, a machine produces bolts that have an average length of 3 inches with a variance of .03. If we randomly select three bolts from this process, what is the probability the mean length of the bolt is at most 3.1 inches?
A) 84.13%
B) 100%
C) 71.57%
D) 28.43%
E) 15.87%

Question

Quizplus · Accepted Answer

σ_x = σ/=/= .1732/1.732 = .1 P(x̅ < 3.1) = P(z < (3.1 − 3)/.1) = P(z < 1) = .8413

In a Manufacturing Process, a Machine Produces Bolts That Have