Use estimation to select the best response. Do not calculate. Which of the following is more probable?
A) Obtaining at least 2 heads in 3 flips of a coin
B) Obtaining at least 2 heads in 4 flips of a coin
C) They are equally probable

Question

Quizplus · Accepted Answer

Intuitively, we can estimate that getting 2 heads out of 3 flips is a bit difficult since there is only one chance to get tails. On the other hand, in 4 flips, there are two chances to get tails, which increases the probability of obtaining at least 2 heads. Therefore, the probability of obtaining at least 2 heads in 4 flips of a coin is more probable than obtaining at least 2 heads in 3 flips of a coin.

Use Estimation to Select the Best Response