Question: Refusal rate in telephone polls is known to be approximately 20%. A newspaper report indicates that 50 people were interviewed before the first refusal. (a)

Refusal rate in telephone polls is known to be approximately 20%. A newspaper report indicates that 50 people were interviewed before the first refusal.

(a) Comment, on the validity of the report. Use a probability in your argument.

(b) What is the expected number of people interviewed before a refusal?

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