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AP ICET 10 Sep 2020 Shift 2 Paper

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Question : 145

Total: 200

Statistical Ability

A population with two groups has 250 items with mean 15.6 and variance 13.44. The first group of 100 items has mean 15 and variance 9. Then the standard deviation of the second group is

2.0
2.5
3.0
4.0

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