Question 435584
(a) 0.32 inches is 2 standard deviations above the mean.  Hence by the Empirical rule, 95% of the distribution is between [0.28, 0.32], or 2.5% would be greater than 0.32 inches, or a probability of 0.025.

(b) 100* 0.025 = 2.5 bolts.