During July in Jacksonville, Florida, it is not uncommon to have afternoon thunderstorms. On average, 10 days have afternoon thunderstorms. What is the probability that a randomly selected day in July will not have a thunderstorm?
To calculate the probability that a randomly selected day in July will not have a thunderstorm, we need to find the complementary probability.
The total number of days in July is 31, and on average, 10 days have afternoon thunderstorms. So, the number of days without a thunderstorm is 31 - 10 = 21.
Therefore, the probability that a randomly selected day in July will not have a thunderstorm is 21/31.