Among passenger cars traveling on the Pennsylvania Turnpike…

Among passenger cars traveling on the Pennsylvania Turnpike on Thanksgiving weekend: 60% have only the driver 30% have 3 people in the car 10% have 4 people in the car You stop along the turnpike and observe the next passenger car that passes. What is the expected number of people in that car?

A study compared men who exercised regularly with men who di…

A study compared men who exercised regularly with men who did not exercise regularly. Among men who exercised regularly, 4% had a heart attack. Among men who did not exercise regularly, 12% had a heart attack. In the scenario above, which statistic is represented by 12%?

Customers at a gas station pay with a credit card, a debit c…

Customers at a gas station pay with a credit card, a debit card, or cash. On a certain day, 150 customers paid with a credit card, 90 paid with a debit card, and 60 paid with cash. One customer from that day is selected at random. What is the probability that the selected customer paid with a credit card?