The express check-out lanes at Wally\'s Supermarket are limited to customers pur

Question

The express check-out lanes at Wally's Supermarket are limited to customers purchasing 12 or fewer items. Cashiers at this supermarket have complained that many customers who use the express lanes have more than 12 items. A recently taken random sample of 200 customers entering express lanes at this supermarket found that 76 of them had more than 12 items. Construct a 95% confidence interval for the percentage of all customers at this supermarket who enter express lanes with more than 12 items. Round the answers to the nearest integer.

Explanation / Answer

we need standard deviation

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