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assume that 20 parts are checked each hour and that x denotes the number of parts in the sample of 20 that require rework .parts are assumed to be independent with respect to rework ,find 1-if the percentage of the require rework remains at 1% ,what is the probability that hour 10 is the first sample at which x exceeds 1 2- if the rework percentage increases to 4% what is the probability that hour 10 is the first sample at which x exceeds 1

3-if the rework percentage increases to 4% ,what is the expected number of hours until x exceeds 1