Ten voters

Topic: Random variables and distributions · more questions on this topic
‹ The smaller face The larger coordinate ›

In a large population, 40% vote for candidate A. Ten people are drawn independently. Find the probability that exactly four of them vote for A.

Worked answer (click to show)

The number who vote for A is \operatorname{Bin}(10,0.4), so the probability of exactly four is \binom{10}{4}(0.4)^4(0.6)^6.