00:01
Based on data from a statistical abstract, only about 11 % of senior citizens get the flu each year.
00:06
However, about 26 % of people under 65 years old get the flu each year.
00:11
In the general population, there are 11 .5 % senior citizens.
00:16
What's the probability that a person selected at random from the general population is a senior citizen who will get the flu? so a senior citizen, there's 11 .5%, so we'll do 0 .115%.
00:37
Times the probability of a senior citizen with the flu, which is 0 .2, nope, excuse me, 11%, so 0 .11, will give us a probability of 0 .01265.
00:56
What is the probability that a person selected at random from the general population is under the age of 65? under the age of 65, who will get the flu? so if 11 .5 % is above the age of, or 65 are over, then one minus that, which is 0 .885, and 26 % are of people under the age of 65 get the flu for a total probability of 0 .2301...