A data entry clerk knows that on average, she will key in wrong data after three hours

Question:

A data entry clerk knows that on average, she will key in wrong data after three hours of continuous working.

Suppose the data entry clerk works for five continuous hours. Use a Poisson probability model to find

a) the probability that she did not key in any wrong data.

b) the probability that she keyed in at least one wrong data.

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