A supermarket selected a sample of 200 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 90% of its customers to be check out in 9 minutes or less. From the data, the 90th and 60th percentiles were computed to be 9.7 minutes and 7.2 minutes, respectively. The range of the data was 13 minutes and the fastest anyone was checked out was 1.1 minutes.Approximately how many customers waited 7.2 minutes or less to be checked out?What percentage of the customers were checked out between 7.2 and 9.7 minutes?
A supermarket selected a sample of 200 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 90% of its customers to be check out in 9 minutes or less. From the data, the 90th and 60th percentiles were computed to be 9.7 minutes and 7.2 minutes, respectively. The
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