According to popular belief, 80% of adults enjoy drinking beer. Choose a group of 4 adults at random. The probability that all of them enjoy drinking beer is:
A) 3.200
B) 0.410
C) 0.200
D) 0.250

Question

Quizplus · Accepted Answer

The probability that all 4 adults enjoy drinking beer, given that each has an 80% (or 0.8) chance independently, is calculated by multiplying the probabilities together: $0.8 \times 0.8 \times 0.8 \times 0.8 = 0.4096$, which rounds to 0.410.

According to Popular Belief, 80% of Adults Enjoy Drinking Beer