The following data represent the length of shaft life of machine, in years of 36 machines Table 1 19 21 12 11 23 14 12 19 18 13 15 7 20 11 14 18 17 12 12 19 15 6 15 11 10 6 25 20 16 9 8 14 14 10 a. Construct a cumulative and relative frequency distribution using 6 classes. b. Find the mean, median and mode for the life span of shaft. c. Find 4th deciles and 41h percentile d. Also construct the histogram and comment the shape of the data.

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.