# Question: In Exercise 3 66 recall that 20 parts are checked

In Exercise 3-66, recall that 20 parts are checked each hour and that X denotes the number of parts in the sample of 20 that require rework.

(a) If the percentage of parts that require rework remains at 1%, what is the probability that hour 10 is the first sample at which X exceeds 1?

(b) If the rework percentage increases to 4%, what is the probability that hour 10 is the first sample at which X exceeds 1?

(c) If the rework percentage increases to 4%, what is the expected number of hours until X exceeds 1?

(a) If the percentage of parts that require rework remains at 1%, what is the probability that hour 10 is the first sample at which X exceeds 1?

(b) If the rework percentage increases to 4%, what is the probability that hour 10 is the first sample at which X exceeds 1?

(c) If the rework percentage increases to 4%, what is the expected number of hours until X exceeds 1?

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