A supermarket selected a sample of 190 of its customers and measured how long th

Question

A supermarket selected a sample of 190 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 $ 5% of its customers to be checked out in less than 8.5 minutes. From the data, the 90^th and 60^th percentiles were computed to be 8.8 minutes and 7.1 minutes, respectively. The ranges of the data was 13 minutes and the fastest anyone was checked out was 1.9 minutes. What was the longest time (in minutes) anyone waited in line?

Explanation / Answer

Range is 13 minutes.

Fastest checkout means lowest data value is 1.9 minutes.

Range : Maximum - Minimum

13 = Maximum - 1.9

Maximum = 14.9

That is longest time anyone waited is 14.9 minutes.

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