1 A mobile valet service visits an office car park every Monday. It offers exterior-only washes and full valets. Purchases of exterior-only washes and full valets have independent Poisson distributions with means 7.2 and 4.1 respectively. li) Find the probabilities that, on any Monday la) exactly seven customers purchase exterior-only washes (b) at least two full valets are purchased lc) exactly seven customers purchase exterior-only washes and exactly three customers purchase full valets. liil Bu uein

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