q1-Mean and Variance of Discrete Random Variable

What do you call the weighted average of the possible values that a random variable can take?

• Variance of discrete random variable

• Simple Variance

• Mean of discrete random variable

• Simple Mean

Which tells us how much we can expect results to deviate from expected value?

• Variance of discrete random variable

• Simple Variance

• Mean of discrete random variable

• Simple Mean

Which of the following statements is a description of low variance?

• The probability of scores is almost the same as the mean.

• The data are close to the mean.

• Both statements A and B

• None of the above

Which of the following statements is a description of high variance?

• The probability of scores is almost the same as the mean.

• The probability of scores are scattered around the mean.

• The data are close to the mean

• All of the above.

What must be the sum of the probabilities P(X) of all the values in the discrete random variable?

• 1%

• 10%

• 100%

• 1000%

What measure should you use to determine what most likely be the probability of an event to happen?

• Variance of discrete random variable

• Simple Variance

• Mean of discrete random variable

• Simple Mean

What measure should you use to determine how far or close the probability of events from the center or the mean?

• Variance of discrete random variable

• Simple Variance

• Mean of discrete random variable

• Simple Mean

Based from the data given, more likely, how many boxes of facemask would the pharmacy sell per day?

• 5

• 6

• 9

• 10

What is the mean of the discrete random variable?

• 5.9

• 6.9

• 7.9

• 8.9

Which of the following statements best interpret the computed mean?

• The pharmacy would sell more or less 8 boxes of facemask per day.

• The pharmacy would sell more than 7 boxes of facemask per day.

• The pharmacy would sell exactly 7 boxes of facemask per day.

• The pharmacy would sell 8 boxes of facemask per day.