A bag contains 7 red and 3 blue marble. You

A bag contains 7 red and 3 blue marble. You draw three marbles from this bag without replacement. Let X be the number of blue marbles you get.

a) Is X a discrete or a continuous random variable?

b) Determine the probability distribution function f (x) and the cumulative distribution function F (x) For the random variable X.

c) Using F(x) Find P(X £ 1).


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