Mathematics, 25.02.2020 16:22 estermartinez

When a survey calls residential telephone numbers at random, only 40% of the calls reach a live person. You watch the random dialing machine make 20 calls.

(a) What is the probability that exactly 3 calls reach a person? (Use 3 decimal places.)

(b) What is the probability that 3 or fewer calls reach a person? (Use 3 decimal places.)

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