A large grocery store chain believes that 75% 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 18 customers and observed whether or not they used the card. Complete parts a through c. Question content area bottom Part 1 a. Assuming that the 75% use rate is correct, what is the probability that 14 or more people in the sample used the card? The probability is enter your response here. (Round to four decimal places as needed.)