Resolve the following with the corresponding formulas where they apply.

Suppose that the number of defects in the production of electronic equipment follows an approximately normal distribution with N (20,5). This is with an average of 20 defects and a standard deviation of 5. It uses the normal distribution to determine the probability that defects found in production are:

a. less than the equal to 25.

b. greater than or equal to 25

c. less than equal to 20

d. greater than or equal to 20

Resolve the following with the corresponding formulas where they apply.

In a clothing store customers return 30% of the units purchased. Use the binomial distribution (see below) to determine the probability that in the next 9 sales:

a. No pieces of clothing returned

B. 3 pieces of clothing are returned

c. Less than 3 pieces are returned