Question

A survey of teenagers found the music preferences listed. If you pick a teenager at random, what is P(rock)?
Country : 12
Jazz : 5
Rock : 7
Classical : 6
New Age : 6
Other : 4
A.33/40
B.1/7
C.7/40
D.1

Answer 1

        We can see from this survey that 7 teenagers prefer rock and roll.
        The number of all teenagers in the survey is:
        12 + 5 + 7 + 6 + 6 + 4 = 40
        P ( rock ) = 7 / 40
        Answer: C ) 7 / 40