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There are 4 cards numbered 1,3,5 and 7, one number on one card
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There are 4 cards numbered 1,3,5 and 7, one number on one card. Two cardsare drawn at random without replacement. Let X denote the sum of thenumbers on the two drawn cards. Find the mean and variance of X.

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There are 4 cards numbered 1,3,5 and 7, one number on one card. Two cardsare drawn at random without replacement. Let X denote the sum of thenumbers on the two drawn cards. Find the mean and variance of X.
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Practice questions from similar books

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The mean of five observations is 4 and their variance is 5.2. If three of these observations are 1,2 and 6, then the other two are

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Algebraic sum of all the deviation from 30 of 50 observations is 50. Find their mean (A) (B) (C) (D)

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Question 3
Give one example of a situation in which
(i) the mean is an appropriate measure of central tendency.
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Question 4
Mean and variance of five observations are and respectively. If three of these observations are then find absolute difference between the other two observations (A) (B) (C) (D)

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Question Text
There are 4 cards numbered 1,3,5 and 7, one number on one card. Two cardsare drawn at random without replacement. Let X denote the sum of thenumbers on the two drawn cards. Find the mean and variance of X.