7.The weight of football players is normally distributed with a mean of 190 pounds and a standard deviation of 25 pounds. The probability of a player weighing more than 225 pounds is

a. 0.9192

b.0.5495

c.0.9010

d.0.0808

e.0.0495

f.0.4505

g. 0.9505

8. The life expectancy of a particular brand of tire is normally distributed with a mean of 50,000 and a standard deviation of 5,000 miles. What percentage of tires will have a life of 44,000 to 56,000 miles?

a.38.49%

b.35.55%

c.86.49%

d.66.67%

e.50.00%

f.76.98%

g.40.44%

9. Which of the following are continuous random variables?

I. The weight of an elephant

II. The time to answer a questionnaire

III. The number of floors in a skyscraper

IV. The square feet of countertop in a kitchen

a.III and IV only

b.I, II, III and IV

c. I and II only

d. II, III and IV only

e. II and III only

f. I, II and IV only

10. An airline has determined that 20% of its international flights are not on time. Use the normal approximation to the binomial distribution to answer the following questions.

What is the probability that of the next 80 international flights, fourteen or less will not be on time?

(Hint: Dont forget to use the "continuity correction factor")

a. 0.3950

b.0.4443

c. 0.4905

d. 0.4202

e. 0.2666

f. 0.3667

g.0.3372