Elementary Stats Chapter Two

• 0

• 1

• 2

• 3

• 5

• The mean of the distribution is E.

• The area between B and F is .50.

• The median of the distribution is C.

• The 3rd quartile of the distribution is D

• The area under the curve between A and G is 1.

The weights of laboratory cockroaches follow a Normal distribution with mean 80 grams and standard deviation 2 grams. The following figure is the Normal curve for the distribution of weights. About what percent of the cockroaches have weights between 76 and 84 grams?

• 99.7%

• 95%

• 68%

• 47.5%

• 34%

• Pete's score was below the median.

• Pete did worse than about 63% of the test takers.

• Pete did worse than about 73% of the test takers.

• Pete did better than about 63% of the test takers.

• Pete did better than about 73% of the test takers.

5.64, 1.44

5.64, 1.32

5.40, 1.44

5.40, 1.32

5.64, 1.20

• 5.64, 1.44

• 5.64, 1.32

• 5.40, 1.44

• 5.40, 1.32

• 5.64, 1.20

• 20%

• 40%

• 50%

• 60%

• 80%

• 4.83 inches

• 5.18 inches

• 6.04 inches

• 8.93 inches

• The standard deviation cannot be computed from the given information.

• 1" (inch)

• 3" (inches)

• 4" (inches)

• 6" (inches)

• 12" (inches)

Which of the following is not correct about a standard Normal distribution?

• The proportion of scores that satisfy 0 < z < 1.5 is 0.4332.

• The proportion of scores that satisfy z < -1.0 is 0.1587

• The proportion of scores that satisfy z > 2.0 is 0.0228

• The proportion of scores that satisfy z < 1.5 is 0.9332

• The proportion of scores that satisfy z > -3.0 is 0.9938

When Sam goes to a restaurant, he always tips the server $2 plus $10% of the cost of the meal. If Sam's distribution of meal costs has a mean of $9 and a standard deviation of $3, what are the mean and standard deviation of his tip distribution?

• $2.90, $0.30

• $2.90, $2.30

• $9.00, $3.00

• $11.00, $2.00

• $2.00, $0.90