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What percentage of the customers were checked out

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A supermarket a supermarket selected a sample of 170 of its customers and measured how long they took to be served at the checkout counter if too many customers wait too long the supermarket intends to hire more checkout person specifically the supermarket would like at least 85% of its customers to be checked out in 8.5 minutes or less from the data the 90th and 60th percentile score computed to be 8.6 minutes and 6.7 minutes respectively the range of the data was 14 minutes and the fastest anyone was checked out was 1.1 minutes what percentage of the customers were checked out between 6.7 and 8.6 minutes

Reference no: EM132461790

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