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Please solve the Statistics Question in 30 minutes with an explanation. Question 3: CUI Attock has three telephone lines. A caller gets a busy tone

Please solve theStatisticsQuestion in 30 minutes withan explanation.

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Question 3: CUI Attock has three telephone lines. A caller gets a busy tone if all the lines are in use. The probability of getting through (to get connected) 0, 1, 2, 3 people is shown in the distribution below. Find the variance and standard deviation for this distribution.( X 0 1 2 3 P(X) 0.20 0.34 0.22 0.24

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