statistics

statistics

The random variable X is the number of sold used cars over a period of time. Its probability distribution is given in the table.

X=x    0    1    2    3    4    5
P(X=x)    0.1    0.2    0.25    0.2    0.15    0.1

a)    What is the expected number of sold used cars?

b)    What is the standard deviation of the number of sold used cars?

c)    Determine the Cumulative Distribution Function?

d)    What is the probability that 3 used cars are sold over a specific period of time?

e)    What is the probability that at most 3used cars are sold over a specific period of time?

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