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For the next three (03) items that follow:
The mean and standard deviation of 100 items are 50, 5 and that of 150 items are 40, 6 respectively.
The mean and standard deviation of 100 items are 50, 5 and that of 150 items are 40, 6 respectively.
[NDA I 2014]
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Question : 97 of 100
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What is the combined standard deviation of all 250 items?
[NDA I 2014]
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