A box contains four 75 W lightbulbs, three 60 W lightbulbs, and three burned-out lightbulbs. Two bulbs are selected at random from the box without replacement. Let X represent the number of 75 W bulbs selected a) Find the probability mass function for X. b) Show that X follows a valid probability mass function. c) Find P(X> 0). d) Find .. e) Find a ².

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