A quality audit of a bottling company showed the number of defective batches outside of the

specification limits for a particular oil product. The grouped data shown in the table below

indicates the number of defective items per unit of measurement.

CLASS f CUM

LIMITS MARK(X)

20-<25 1

25-<30 2

30-<35 8

35-<40 5

40-<45 3

45-<50 1

TOTAL

3.1.1 Complete the table data under the given columns.

3.1.2 Calculate the mean value.

3.1.3 Draw the cumulative frequency polygon and then use your graph to determine the

median.

3.1.4 Use the values from 3.1.2 and 3.1.3 to comment on the nature of the distribution.Give a reason

for your answer