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Question 1

Mean (mu) of a random variable X?

Answer 1

Expected value (E(X)) and its the average of X.

Question 2

The mean of a random variable is the?

Answer 2

Center of gravity or bouncing point for a random variable’s distribution.

Question 3

Quantile?

Answer 3

The numbers are going to be a value between 0 and 1, whole ignoring most P(X <= Q_p)

Question 4

Median of a distribution?

Answer 4

Median puts half of area on left and other half on right.

Question 5

!!!With a discrete variable, is it possible for more than one satisfy these conditions?

Question 6

In terms of proportions, which are the benefits of a median?

Answer 6

50% in one side and 50% in the other side.

Question 7

A variance is a random variable X in which?

Answer 7

It measures the average squared distance between the mean and the random variable

Question 8

Can variance be negative?

Answer 8

No, they are always positive.

Question 9

If variance of a random variable will only be equal to zero if the random variable can only has how many values in its sample space with a positive probability?

Answer 9

One

Question 10

Units of a variance will be the original units of measured squared.

Answer 10

X = inches, sigma_s^2 = inch^2