According to a recent survey, 38% of U.S. households used only cell phones for their phone service. A random sample of four households was selected. The probability that the first three used only cell phones and the third had a landline is----- .

Question

Quizplus · Accepted Answer

The probability that the first three households use only cell phones is $0.38^3$ and the probability that the fourth household uses a landline (thus not using only cell phones) is $1 - 0.38 = 0.62$. Multiplying these probabilities gives $0.38^3 \times 0.62 = 0.034$.

According to a Recent Survey, 38% of U