Random Variable and Probability Distribution, Mean and Variance

In sampling distribution, the mean of the sample means is equal to the ______

• population mean

• population variance

• sample mean

• sample variance

It is a numerical quantity that is assigned to the outcome of an experiment.

• random variable

• variable

• probability

• probability distribution

It is the central or average of its corresponding probability mass function.

• mean

• variance

• standard deviation

• probability

What is the mean outcome if a pair of die is rolled once?

• 1.5

• 2.5

• 3.5

• 4.5

Find the mean of the probability distribution involving the random variable X that gives the number of heads that appear after tossing four coins once.

• 4

• 3

• 2

• 1

The probabilities that a printer produces 0,1,2, and 3 misprints are 42%, 28%, 18%, and 12% respectively. What is the mean value of the random variable?

• 1

• 2

• 3

• 4

These are two values that describe how scattered or spread out the scores are from the mean value of the random variable.

• variance and standard deviation

• mean and probability distribution

• probability and statistics

• mean and variance

What is the total area in the distribution under the normal curve?

• 0

• 1

• 2

• 3

Which of the following is a parameter of normal distribution?

• mean

• standard deviation

• mean and standard deviation

• none of the above

If two coins are tossed once, which is NOT a possible value of the random variable for the number of heads?

• 0

• 1

• 2

• 3