Dot Compliant,Not Compliant
Northeast... 96,62
Midwest... 86,43
South... 92,49
West... 76,16
Total... 350,170

a. Use the sample data to compute an estimate of the probability that a motorcyclist wears a DOT-compliant helmet.

b. The probability that a motorcyclist wore a DOT-compliant helmet five years ago was .48, and last year this probability was .63. Would the National Highway Traffic Safety Administration be pleased with the most recent survey results shown above?

c. What is the probability of DOT-compliant helmet use by region of the country?

What region has the highest probability of DOT-compliant helmet use?