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Suppose that a Walmart customer selected at random, spends on the average $70 with a standard deviation of $10. Assume also that the corresponding probability

Suppose that a Walmart customer selected at random, spends on the average $70 with a standard deviation of $10. Assume also that the corresponding probability distribution is normal.

a) Find the probability that a customer selected at random spends less than $80.

b) Find the probability that a customer selected at random spends greater than $80

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