A fair coin is flipped twice. What is the expected value of the number of heads?
1
0
2
1.5
In a standard deck of 52 cards, you draw one card. What is the probability of drawing a heart or a spade?
1/4
1/52
1/13
1/2
What does the addition rule of probability calculate?
Probability of an event NOT occurring
Probability of two events occurring given that one has already happened
Probability of one event OR another event occurring
Probability of one event AND another event occurring
You roll a fair six-sided die. What is the probability of rolling a number greater than 4?
2/3
1/3
1/6
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?
1.2
0.5
A basketball player makes 80% of her free throws. What is the probability that she makes her first free throw on her third attempt?
0.8
0.16
0.008
0.032
How is a random variable different from a regular variable in programming?
Random variables have an associated probability distribution.
Regular variables cannot be used in statistical analysis.
Random variables can only store numeric data.
There's no difference, both terms are interchangeable.
A fair coin is tossed three times. What is the probability of getting exactly two heads?
1/8
3/8
If the PDF of a continuous variable is a flat line over a range, what does this imply about the distribution?
It's uniformly distributed.
It's a Poisson distribution.
It's normally distributed.
It's exponentially distributed.
A committee of 3 people is to be formed from a group of 5. How many different committees are possible?
60
15
10
20