How can I solve following questions by Excel whats formulas

How can I solve following questions by Excel, what’s formulas should be used.

a) In a textile manufacturing process 2 flaws on average occur per every 50 yards of material produced. What is the probability of having no flaws in a randomly selected 25 yards of material?

b) You have a friend who makes 78% of the free throws he shoots, on average. He bets you $5 that if he shoots 10 free throws he will make at least 8 of them. What is the probability that you will win the bet?

c) 8 out of the 16 members of a large bank’s board of directors are in favor of continuing the policy of awarding large performance bonuses to members of upper management. If the media for interviews randomly selects two boards of directors’ members, what is the probability that both board members interviewed will be in favor of continuing the bonus policy?

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