In Example 3, use the normal curve to approximate the probability that in the sample there are

(A) From 5 to 9 users of the credit card.

(B) More than 10 users of the card.

Data from Example 3

A credit card company claims that their card is used by 40% of the people buying gasoline in a particular city. A random sample of 20 gasoline purchasers is made. If the company’s claim is correct, what is the probability that

From 6 to 12 people in the sample use the card?

Fewer than 4 people in the sample use the card?