Question: Suppose that at a certain library, the weights of the books (in ounces) follow a normal distribution with mean µ = 14 ounces and standard deviation σ = 3 ounces.

a. What’ the probability that the book will weigh more than 15.5 ounces?

b. What’s the probability that the book will weigh between 9.5 and 15.5 ounces?

c. What weight value separates the heaviest 10% of all books from the other 90% (i.e. what is the value of the 90^th percentile of the distribution of book weights)?