Salick Academy

The Binomial Distribution

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Original questions written at exam standard. Work each one before you open the solution.

Difficulty
Question 1 Foundation
State the four conditions for a binomial model.
Question 2 Foundation
XB(10,0.3)X \sim B(10, 0.3). Find E(X)E(X).
Question 3 Standard
XB(5,0.5)X \sim B(5, 0.5). Find P(X=2)P(X = 2).
Question 4 Standard
XB(10,0.3)X \sim B(10, 0.3). Find Var(X)\operatorname{Var}(X).
Question 5 Stretch
XB(8,0.25)X \sim B(8, 0.25). Find P(X1)P(X \ge 1), to 3 significant figures.
Question 6 Stretch
Why is drawing 5 cards from a deck without replacement not a binomial situation?