The numbers of defective items in successive groups of fifteen items were counted as they came off the production line. The results are summarized as follows: No. of Defectives Frequency 57 1 57 2 18 4 3 a. Calculate the mean number of defective items in a group of fifteen items. b. Calculate the variance and standard deviation of the number of defectives in a group.

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The numbers of defective items in successive groups of fifteen items were counted as they came off the
production line. The results are summarized as follows:
No. of Defectives
Frequency
57
1
57
2
18
4
3
a. Calculate the mean number of defective items in a group of fifteen items.
b. Calculate the variance and standard deviation of the number of defectives in a group.
Transcribed Image Text:The numbers of defective items in successive groups of fifteen items were counted as they came off the production line. The results are summarized as follows: No. of Defectives Frequency 57 1 57 2 18 4 3 a. Calculate the mean number of defective items in a group of fifteen items. b. Calculate the variance and standard deviation of the number of defectives in a group.
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