Fifty percent of the people that use the Internet order something online. Find the probability that only five of 8Internet users will order something online.
A) 0.219
B) 0.625
C) 0.004
D) 1.750

Question

Quizplus · Accepted Answer

This is a binomial probability problem where n = 8 (number of trials), k = 5 (number of successes), and p = 0.5 (probability of success on a single trial). The binomial probability formula is P(X = k) = (n choose k) * p^k * (1-p)^(n-k). Plugging in the values, we get P(X = 5) = (8 choose 5) * (0.5)^5 * (0.5)^(8-5) = 56 * 0.00390625 = 0.219.

Fifty Percent of the People That Use the Internet Order