According to the Insurance Research Council, 14% of U.S. drivers are uninsured. A random sample of seven drivers was selected. What is the mean of this distribution?

Question

Quizplus · Accepted Answer

The mean of a binomial distribution is given by $n \times p$, where $n$ is the number of trials (in this case, 7 drivers) and $p$ is the probability of success (in this case, the probability that a driver is uninsured, which is 14% or 0.14). Thus, the mean is $7 \times 0.14 = 0.98$.