A large grocery store chain believes that 78% of its customers use the store's "Savings Card" when they make purchases. The manager in charge of the "Savings Card" program has randomly sampled 23 customers and observed whether or not they used the card. Complete parts a through c. a. Assuming that the 78% use rate is correct, what is the probability that 18 or more people in the sample used the card?

The probability that 18 or more people in the sample used the card is P=0.6049.

Step-by-step explanation:

This question can be solved using the binomial distribution, with size n=23 and p=0.78.

The probability that 18 out of 23 people uses the card is:

The probability that 18 or more people in the sample used the card is P=0.6049.

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