Question: Every time when one strikes at a target one can get one, two or three points with the corresponding probability of 3 1 0 ,

Every time when one strikes at a target one can get one, two or three points with the
corresponding probability of 310,210 ir 110. One strikes two times. The sum of the points is
a discrete random variable. Find the distribution of this variable and calculate the expected
value and the variance of it.
 Every time when one strikes at a target one can get

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