1. Explain the difference between a population and a sample. Give five examples.

2. A grocery store sells an average of 478 loaves of bread each week. Sales (X) are normally distributed with a standard deviation of 17.

(a) If a random sample of size n = 1 (week) is drawn, what is the probability that the X value will exceed

495?

(b) If a random sample of size n = 4 (weeks) is drawn, what is the probability that the X value will exceed

495?

(c) Why does your response in part (a) differ from that in part (b)?