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The average amount of time that customers spend of hold with Bank A is 2 minutes and is exponentially distributed. Find: (a) The probability I

The average amount of time that customers spend of hold with Bank A is 2 minutes and is exponentially distributed. Find: (a) The probability I wait less that 3 minutes (b) The probability I wait more than 100 seconds (c) The probability I wait between 1 and 2 minutes.

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