college math - biostatistics

hey... first time user and really lost. wondering if someone can help:

Based on data from the Statistical Abstract of the United States, 112th Edition, only about 14%
of senior citizens (65 years old or older) get the flu each year. However, about 24% of the
people under 65 years old get the flu each year. In the general population, there are 12.5% senior
citizens (65 years old or older).
a) What is the probability that a person selected at random from the general population is a
senior citizen who will get the flu this year?
b) What is the probability that a person selected at random from the general population is a
person under age 65 who will get the flu this year?
c) Answer parts a) and b) for a community that has 50% senior citizens?

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asked by will
  1. a)(0.125) x (0.14) = ?
    b)(0.875) x (0.24) =
    c)(0.50)x(0.14) + (0.50)x(0.24) = ?

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    posted by drwls
  2. where did the o.875 come from

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