Should she suspect a mistake if the cashier asks her

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A shopper buys 36 items at random in a supermarket, where, because of the sales tax imposed, the final digit (the number of pence) in the price is uniformly and randomly distributed from 0 to 9. Instead of adding up the bill exactly, she rounds each item to the nearest 10 pence, rounding up or down with equal probability if the price ends in a "5". Should she suspect a mistake if the cashier asks her for 23 pence more than she estimated?

Reference no: EM13887302

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