AP Statistics Chapter 6 Test

A binomial event has n = 60 trials. The probability of success on each trial is 0.4. Let X be the count of successes of the event during the 60 trials. What are mean X and standard deviation X?

• 24; 3.79

• 24; 14.4

• 4.9; 3.79

• 4.9; 14.4

The GPA of students who take the AP Statistics exam are approximately normally distributed with a mean of 3.4 with a standard deviation of 0.3. What is the probability that a student selected at random from this group has a GPA lower than 3?

• 0.0918

• 0.4082

• 0.9082

• -0.0918

The probability of x, the number of tires needing replacement on a randomly selected automobile checked at a certain inspection station is given in the following table. What is the standard deviation of X?

• 1.2

• 2.52

• 1.58

Which of the following are discrete?

• I and III only

• II and III only

• I and IV only

• II and IV only

• 0

• 1

• 2

• 3

• 5

• 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.

• 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.

• 1" (inch)

• 3" (inches)

• 4" (inches)

• 6" (inches)

• 12" (inches)

• The median is at the yellow line and the mean is at the red line

• The median is at the red line and the mean is at the yellow line

• The mode is at the red line and the median is at the yellow line

• The mode is at the yellow line and the median is at the red line

• The mode is at the red line and the mean is at the yellow line