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Metro bus travel from Rawalpindi to Islamabad every day. The metro buses pass through Chamman Station between 4:00 PM to 6:00 PM and 50 passengers

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Metro bus travel from Rawalpindi to Islamabad every day. The metro buses pass through Chamman Station between 4:00 PM to 6:00 PM and 50 passengers are allowed to sit in the bus. The number of buses has the following distribution X 4 5 6 7 8 p(X=x) 1/12 1/12 1/4 1/4 1/6 1/6 Suppose the function 2X-1 represents the token given to the custodian in 30 Rs. Find the custodian's average earnings and also the dispersion

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