Question

Based on a poll 60% of adults believe in reincarnation. Assume that 4 adults are randomly selected, and find the indicated probability.

Answer 1

a) $P(X=3)=C_4^30.6^40.4^1=0.346.$

b) $P(X=4)=C_4^40.6^40.4^0=0.130.$

c) $P(X\ge3)=P(X=3)+P(X=4)=0.475.$