About what percentage of households have a number of cars within 2 standard deviations of the mean?

a. 68%

b. 71%

c. 93%

d. 95%

e. 98%

Choose an American household at random and let the random variable X be the number of cars (including SUVs and light trucks) they own. Here is the probability distribution if we ignore the few households that own more than 5 cars:

Select the best answer.

Transcribed Image Text:

Number of cars 1 2 3 4 5 Probability 0.09 0.36 0.35 0.13 0.05 0.02