Probability Distribution

What is the value of p in the probabiity distribution shown in the image?

• 0.5

• 0.15

• 0.05

• 0.1

The table represents the probability of guessing correct on a 5 question true-false quiz.  Find the probability for at least 4 questions correct.

• .03125

• .15625

• .3125

• .1875

What is the variance of the probability distribution given in the image? Write your answer with 3 significant digits.

What E(x) for probability distribution given in the image?

• 2.4

• .103

• -1.03

• 1.03

• 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

• $2.50

• $5

• -$2.50

• $0

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 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

A stockbroker estimates that at the end of the year, there is a 40% chance a stock will be worth $50, a 35% chance it will be worth $60 and a 25% chance it will be worth $70.
What expected value does this broker assign to this stock's end-of-the-year price?

• $58.50

• $60.00

• $62.50

• $65.00

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?