SAT Mathematics Practice Test 3

Of the 25 people who entered the contest,
there are 8 females under age 40 and 2 males age 40 or older.
Therefore, the probability that the contest winner will be either a female under age 40 or a male age 40 or older is

8

25

+

2

25

=

10

25.

Choice A is incorrect and may be the result of dividing 8 by 2, instead of adding 8 to 2, to find the probability.
Choice C is incorrect; it is the probability that the contest winner will be either a female under age 40 or a female age 40 or older.
Choice D is incorrect and may be the result of multiplying 8and 2, instead of adding 8 and 2, to find the probability