Beginner

Probability Questions

Data Science
10 questions

Question 1

Which of the following measures the spread or dispersion of a random variable's values around its expected value?

Question 2

A random variable X has a probability distribution as follows: P(X=0) = 0.2, P(X=1) = 0.3, P(X=2) = 0.5. What is the expected value of X?

Question 3

A committee of 3 people is to be formed from a group of 5. How many different committees are possible?

Question 4

Which of the following is an example of a discrete random variable?

Question 5

Which of the following is NOT a valid probability value?

Question 6

What is the variance of a standard normal distribution (mean = 0, standard deviation = 1)?

Question 7

You are playing a game where you roll a die until you get a 6. What is the probability that you will roll the die exactly 4 times before winning?

Question 8

If the PDF of a continuous variable is a flat line over a range, what does this imply about the distribution?

Question 9

You roll a fair six-sided die. What is the probability of rolling a number greater than 4?

Question 10

A random variable representing the number of website visitors in an hour is an example of what type of variable?