Random Variable Rules

State whether it is Discrete or Continuous;

The number of heads when tossing a coin 50 times

• Discrete

• Continuous

The number of correct questions in a 10 - question test

• Discrete

• Continuous

Which of the statements refers to discrete random variable?

• A discrete random variable has a number of possible values. 
  

• A discrete random variable has a countable number of possible values. 
  

• A discrete random variable has a measurable number of possible values. 
  

What do you call a random variable with possible values that form a finite or countable set?

• continuous

• discrete

• finite

• infinite

What term is used to describe the average value of a discrete random variable over numerous trials of an experiment?

• mean

• probability

• standard deviation

• variance

What formula is described by σ² = ∑[x² * P(x)] − u²?

Which of the following represents the mean value of a discrete random variable?

• Expected value

• Median

• Standard deviation

• Standard deviation

Which of the following is the correct formula to find the expected value of the probability distribution?

• E(x) = ∑[x ∙ P(x)]

• E(x) = ∑[x²∙ P(x)]

• E(x) = ∑[x² ∙ P(x)] − u²

Find the value of k

• ¹/₁₅

• ¹/₅

• ¹/₁₀

• ¹/₁₄

Find the value of k

• ¹/₁₅

• ¹/₁₆

• ¹/₁₇

• ¹/₁₄