Binomial, Poisson, and Multinomial Distributions

A binomial distribution has only two possible outcomes. You can think of them as successes and failures. For the correct answers, the successes are: a flip of heads, a win for Susan, a group member who has passed the midterm, and a correct answer on a multiple-choice question.

You may use the Binomial Calculator $(n = 10, p = .5, > or = 8)$. Otherwise add up the probability of getting 8, 9, and 10 heads: .044 + .01 + .001 = .055

Use the Binomial Calculator $(n = 20, p = .3, > or = 8). p = .23$

Use the Binomial Calculator ($n = 20, p = .3$, less than or $= 3)$. $p = .11$

$M = np = 20 \times .3 = 6$

$Var = np(1-p) = 50(.6)(1-.6) = 12$