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UPSC NDA Math Model Paper 4

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Question : 91

Total: 120

Let X denote the number of scores which exceeds 4 in 18 tosses of a symmetrical die. Consider the following statements:
1. The arithmetic mean of X is 6
2. The standard deviation of X is 2
Which of the above statements is/are correct?

1 only
2 only
Both 1 and 2
Neither 1 nor 2

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