Probability Distribution Review

• Yes, because all of the probabilities are between 0 and 1 inclusive and the sum of all the probabilities is 1.
• No, all probabilities are not be between 0 and 1 inclusive
• No, the sum of all the probabilities is not 1.
• Yes, because the distribution is symmetric

Compare these two distributions.

• Same mean different standard deviation

• Same standard deviation different mean

What does this symbol represent?

• Standard Deviation

• Variance

• Mean Absolute Deviation

• Sigma

• Yes, because all of the probabilities are between 0 and 1 inclusive and the sum of all the probabilities is 1.
• No, all probabilities are not be between 0 and 1 inclusive
• No, the sum of all the probabilities is not 1.
• Yes, because the distribution is symmetric

A quiz game has three questions. Each correct answer scores 5 points, and each wrong answer scores 0 points. If a player guesses all answers, assuming a 50% chance of getting each question right, what is the expected score?

• 7.5

• 10

• 12.5

• 15

The following table represents the probability distribution X, the employment status of adults in a city.

What is the probability that the adults isn't retired?

(a)  

• -$2.50

• -$3.33

• $0

• $5

The following table represents the probability distribution X, the employment status of adults in a city. What is the probability that the adults isn't retired?

(a)  

• $2.50

• $5

• -$2.50

• $0