Hi guys,

Problem:

The mean diameter of a batch of bolts is 9.711mm and the standard deviation of the batch is 0.126mm

The tolerance for this batch of components is 9.73mm to 9.97mm.

In a batch of 2000 bolts, determine the following:

a) The percentage of bolts rejected assuming the bolts are normally distributed.

b) The number of bolts greater than 9.91mm

c) The number of bolts less than 9.4mm

It's a tricky one!