A major automobile company is interested in reducing the time that customers have to wait while having their car serviced with one of the dealers. They select four customers randomly each day and find the total time that each customer
(a) Find the - and R-chart control limits
(b) Assuming that the process is in control and the distribution of waiting time is normal, find the percentage of customers who will not have to wait more than 50 minutes.
(c) Find the 2Ï control limits.
(d) The service manager is developing a promotional program and is interested in reducing the average waiting time to 30 minutes by employing more mechanics. If the plan is successful, what proportion of the customers will have to wait more than 40 minutes? More than 50 minutes?
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...
Σχι = 1000 Σ 250 R:
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a The control limits on an Rchart are UCL 228210 2282 LCL 010 0 The control limits o…View the full answer
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