7-38. The amount of time required for a customer at Big Bank to cash a check is...

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7-38. The amount of time required for a customer at Big Bank to cash a check is exponentially distributed with a mean time of 1.35 minutes. Find:

(a) λ

(b) The probability that a customer will cash a check in under 1.25 minutes

(c) The probability that it will take a customer more than two minutes to cash a check

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