Assuming 7 classes with a class interval width of 4 plot, Ask an Expert

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The following maintenance tasks were observed:

Task Time (Min.) Frequency Task Time (Min.) Frequency

35 2 25 12

17 6 19 10

12 2 21 12

15 4 23 13

37 1 29 8

27 10 13 3

33 3 9 1

31 6 - -

a.) What is the range of observations?

b.) Assuming 7 classes with a class interval width of 4, plot the data and construct a curve. What type of distrubtuion is indicated by the curve?

c.) What is the mean repair time?

d.) What is the standard deviation of the sample data?

e.) The system is required to meet a mean repair time of 25 minutes at stated confidence level of 95% Do the data reveal that the specification requirements will be met? Why?

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