Question 7 • TN-Algebra II B SC 26-27 (For Credit)
An amusement park reports that the probability of a visitor riding its largest roller coaster is 30 percent, the probability of a visitor riding its smallest roller coaster is 20 percent, and the probability of a visitor riding both roller coasters is 15 percent.Which equation can be used to calculate the probability of a visitor riding the largest or the smallest roller coaster?
Answer
A
P(largest or smallest) = 0.30 - 0.20
B
P(largest or smallest) = 0.30 + 0.15 - 0.20
C
P(largest or smallest) = 0.30 + 0.20 - 0.15
D
P(largest or smallest) = 0.30 + 0.20
Explanation
Use the addition rule for the probability of either event: add the probability of riding the largest coaster and the probability of riding the smallest, then subtract the probability of riding both so visitors who ride both are not counted twice. This gives 0.30 + 0.20 - 0.15, which is choice C.
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