In a random sample of 100 college students 60 were females 6

In a random sample of 100 college students, 60 were females, 65 were under 21 yrs of age, and 15 males were 21 yrs of age or older. A student is selected at random from this sample.

What is the probability that a female student of age 21 or older is selected?

0.20

0.21

0.75

0.95

Solution

P( Female age 21 o e older) = 20/100 = 0.20