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# How to make x bar chart and R chart

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A bank manager decides to study waiting times of customers for teller service at the noon lunch hour (noon to 1pm). He observes three customers to measure the time the customer enters the line to the time he or she reaches the teller window. He records this over several days.

Time in Minutes

Day Customer #1 Customer #2 Customer #3

1 7.2 8.4 7.9

2 5.6 8.7 3.3

3 5.5 7.3 3.2

4 4.4 8.0 5.4

5 9.7 4.6 4.8

6 8.3 8.9 9.1

Please draw the X-bar Chart and R-chart.

https://brainmass.com/statistics/pie-chart/how-to-make-x-bar-chart-and-r-chart-466303

#### Solution Preview

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For each x bar, it adds up the three values in a row and ...

#### Solution Summary

The solution provides detailed processes how to get x bar chart and R chart.

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## Design an R-chart and X-bar for Canine Gourmet Company. Is the process in control? (See attachment).

The Canine Gourmet Company produces delicious dog treats for canines with discriminating tastes. Management wants the box-filling line to be set so that the process average weight per packet is 43.5 grams. To make sure the process is in control, an inspector at the end of the filling line periodically selects a random box of eight packets and weighs each packet. When the process is in control, the range in weight of each sample has averaged 10 grams.

? Design an R-chart and an x-bar chart for this process...
? The results from the last five samples of eight packets are:
(See attachment).

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