Question

In a class of 35 students, 15 are seniors, 20 are females, and 7 are both a senior and a female. If I choose a student at random, what is the probability I choose a female or a senior?

Answer 1

1.

Explanation:

Prob ( Choosing a female) = 20/35

Prob ( Choosing a senior) = (15)/ 35 = 15/35

Requires probability = 20/35 + 15/35

= 35/35

= 1.

Answer 2

1

Explanation:

15 + 20 / 35

35/35 = 1 (certain)

The probability of choosing a female or senior is 1, because these are the only two groups represented in the class.

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