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A company produces scooters used by small businesses, such as pizza parlors, that find them convenient for making short deliveries. The company is notified whenever a scooter breaks down, and the problem is classified as being either mechanical or electrical. The company then matches the scooter to the plant where it was assembled. The file Scooters contains a random sample of 200 breakdowns. Use the data in the file and the relative frequency assessment method to find the following probabilities:

a. What is the probability a scooter was assembled at the Tyler plant?

b. What is the probability that a scooter breakdown was due to a mechanical problem?

c. What is the probability that a scooter was assem bled at the Lincoln plant and had an electrical problem?

A Harris survey on cell phone use asked, in part, what was the most important reason that people give for not using a wireless phone exclusively. The responses were: (1) Like the safety of traditional phone, (2) Need line for Internet access, (3) Pricing not attractive enough, (4) Weak or unreliable cell signal at home, (5) Coverage not good enough, and (6) Other. The file titled Wireless contains the responses for the 1,088 respondents.

a. Calculate the probability that a randomly chosen respondent would not use a wireless phone exclusively because of some type of difficulty in placing and receiving calls with a wireless phone.

b. Calculate the probability that a randomly chosen person would not use a wireless phone exclusively because of some type of difficulty in placing and receiving calls with a wireless phone and is over the age of 55.

c. Determine the probability that a randomly chosen person would not use a wireless phone exclusively because of a perceived need for Internet access and the safety of a traditional phone.

d. Of those respondents under 36, determine the probability that an individual in this age group would not use a wireless phone exclusively because of some type of difficulty in placing and receiving calls with a wireless phone.