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Grocery store receipts show that customer purchases have a normaldistribution with a mean of $32 and...

Grocery store receipts show that customer purchases have a normaldistribution with a mean of $32 and standard deviation of $20. a) If someone’s spends one standard deviation below the mean, how much did they spend? b) Find the 90thpercentile of purchases.c) Find the probability that a random customer spends more than $35. D).Find the probability that the next 50 customers will spend at least $35 on average.

Math   Statistics-And-Probability   
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