Question: A T-shirt manufacturing company advertises that probability of an individual T-shirt being irregular is 0.1. A box of 10 such T-shirts is randomly selected and inspected.

a) What is the probability that exactly 2 of these 10 T-shits are irregular?

Let "x" be the number of T-shirts that are irregular in all such boxes of 10 T-shirts.

b) Find the mean of x.

c) Find the standard deviation of x.