5.4-5.7 Honors Stats Review

About 20% of cars in North America are white, 20% are black, and 15% are silver. Assume that the color of any car is independent of another. Suppose we choose 10 cars at random and identify the color. Let x=the number of white cars.

Calculate the mean x.

• 1

• 2

• 1.5

• 1.2

About 20% of cars in North America are white, 20% are black, and 15% are silver. Assume that the color of any car is independent of another. Suppose we choose 10 cars at random and identify the color. Let x=the number of white cars. The mean is 2.

Interpret the mean of x.

About 20% of cars in North America are white, 20% are black, and 15% are silver. Assume that the color of any car is independent of another. Suppose we choose 10 cars at random and identify the color. Let x=the number of white cars.

Calculate the standard deviation of x.

• 2

• 2.654

• 1.265

• 1.936

About 20% of cars in North America are white, 20% are black, and 15% are silver. Assume that the color of any car is independent of another. Suppose we choose 10 cars at random and identify the color. Let x=the number of white cars. The standard deviation is 1.265.

Interpret the standard deviation of x.

In normal distribution the mean is (equal to/less than/more than) the median.

• equal to

• less than

• more than

In skewed right distribution the mean is (equal to/less than/more than) the median.

• equal to

• less than

• more than

In skewed left distribution the mean is (equal to/less than/more than) the median.

• equal to

• less than

• more than

Ms. White spends a day at the Autobahn Raceway testing tires. For 400 laps, she records her laptimes in minutes. The data is a normal distribution. The mean is 1.84 and the standard deviation is 0.07. Label the values 1, 2, and 3 standard deviations above and below the mean.

Estimate the percentage of men's heights that are no higher than 74 inches.

• .68

• .95

• .75

• .85

Estimate the percentage of cholesterol levels that are no greater than 140 mg.

• .25

• .162

• .186

• .468