An automobile dealer has 10 Fords, 7 Buicks, and 5 Plymouths on her used-car lot. If a person purchases a used car, find the probability that it is a Ford or Buick.
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Answer:
Given That:
An automobile dealer ha 10 Fords, 7 Buicks, and 5 Plymouths
The probability of an event is the ratio of the size of the event space to the size of the sample space.
The size of the sample space is the total number of possible outcomes
The event space is the number of outcomes in the event you are interested in.
so
Let
x------> size of the event space
y-----> size of the sample space
so
P = x/y
In this problem we have
x = 10+7 =17
y= 10+7+5 =22
substitute
P = 17/22 =0.7727
Convert to percentage
0.7727*100 = 77.27%
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