UPSC NDA I 2014 Mathematics Paper
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Question : 19 of 120
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Let X denote the number of scores which exceed 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. The arithmetic mean of X is 6.
2. The standard deviation of X is 2.
Which of the above statements is/are correct?
[NDA I 2014]
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