The number of ice creams sold per hour from Mr Fishy’s van is observed to be a Poisson random variable with parameter =8. Each ice cream costs two pounds but Mr Fishy has to pay five pounds per hour for the pitch. What is the variance of his hourly profit (measured in pounds and ignoring all other income and expenses)?
2026-04-07 21:36:06.1775597766
How to find variance in Poisson?
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