1 Under the normal curve, the area between z = 1 and z = -2 includes approximately ________ of the values.

a 98%

b 95%

c 85%

d 82%

2 Horatio Oscar Vineeth Lane (HOV Lane for short) records his commute times for a period of one month and assigned them to five different categories as shown in the table.

Which of these events are mutually exclusive?

The duration of Mr. Lane's commute is less than expected; Mr. Lane's commute is between twenty and thirty minutes.

Mr. Lane's commute is longer than 30 minutes; Mr. Lane's commute is longer than 40 minutes.

Mr Lanes commute is between ten and forty minutes; Mr. Lane's commute is between twenty and thirty minutes.

Mr. Lane's commute takes less than ten minutes; Mr Lane's commute exceeds his expected commute.

3. A ________ probability is the probability of a single event occurring.

a subjective

b binomial

c marginal

d joint

4. The weight of a jar of jelly is normally distributed with a mean of 16 oz and a standard deviation of 0.02 oz. What is the probability that a jar of jelly contains more than 16.03 oz?

a .0668

b .1587

c .4332

d .9332

5. The expected value of the standard normal distribution is equal to:

a 0

b 1

c 1.5

d 2

6. Under the normal curve, the area between z = 2 and z = -2 includes ________ of the values.

a 98%

b 96%

c 95%

d 93%

7 A professor would like to assign grades such that 7% of students receive Fs. If the exam average is 62 with a standard deviation of 13, what grade should be the cutoff for an F? (Round your answer.)

a 43

b 49

c 50

s 55

8. The weight of a jar of jelly is normally distributed with a mean of 16 oz and a standard deviation of 0.02 oz. What is the probability that a jar of jelly contains less than 16 oz?

a .1915

b .3085

c .5000

d .7257

9 A fair die is rolled 8 times. What is the probability that an even number (2, 4, or 6) will occur between 2 and 4 times?

a .2188

b .4922

c .6016

d .8204