A supermarket selected a sample of 240 of its customers and measured how long th

Question

A supermarket selected a sample of 240 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 86% of its customers to be checked out in 8.6 minutes or less. From the data, the 90th and 60th percentiles were computed to be 8.6 minutes and 7.3minutes, respectively. The range of the data was 14 minutes and the fastest anyone was checked out was 1.9 minutes.

Step 3 of 5:

Approximately how many customers waited 7.3 minutes or less to be checked out?

Explanation / Answer

here customers waited 7.3 minutes or less is at 60th percentile ; threfore

number of customers waited 7.3 minutes or less to be checked out =np =240*0.60 =144

please revert if there are other parts.

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