7. Engineers must consider the breadths of male heads when designing helmets. The company researchers have determined that the population of potential clientele have head breadths that are normally distributed with a mean of 6.1-in and a standard deviation of 0.9-in.

In what range would you expect to find the middle 95% of most head breadths?

Between_____and_____.

If you were to draw samples of size 36 from this population, in what range would you expect to find the middle 95% of most averages for the breadths of male heads in the sample?

Between_____and_____. Enter your answers as numbers.

Your answers should be accurate to 2 decimal places.

8. A survey of students at a high school is conducted, and the following facts are discovered: 46% of the students have laptops, 34% have tablets, and 5% of the students own both a laptop and a tablet. A student is chosen at random from the high school: what is the probability that the student owns either a laptop or a tablet?

Enter your answer as a percentage.

_____%

10. In a study of brand recognition, 902 consumers knew of Hershey, and 12 did not. Use these results to estimate the probability that a randomly selected consumer will recognize Hershey.

Report your answer as a decimal accurate to 3 decimal places.

prob =_____

11. A poll showed that 50.7% of Americans say they believe that statistics teachers know the true meaning of life. What is the probability of randomly selecting someone who does not believe that statistics teachers know the true meaning of life.

Report your answer as a decimal accurate to 3 decimal places.

prob =_____