A supermarket selected a sample of 260 260 of its customers and measured how lon

Question

A supermarket selected a sample of 260 260 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 personnel. Specifically, the supermarket would like at least 80% 80% of its customers to be checked out in 8 8 minutes or less. From the data, the 90 th 90th and 60 th 60th percentiles were computed to be 10 10 minutes and 7.3 7.3 minutes, respectively. The range of the data was 12 12 minutes and the fastest anyone was checked out was 1.1 1.1 minutes. Step 1 of 5 : What was the longest time (in minutes) anyone waited in line?

Explanation / Answer

Range = Max. - Min

12 = Max - 1.1

Therefore the the longest time taken in waiting is,

= 11 + 1.1 = 12.1 minutes

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