What is the probability of getting tails when you flip a fair coin?
0.25
0.5
1
0
A bag contains 5 red balls and 3 blue balls. What is the probability of drawing a red ball, then another red ball without replacement?
5/14
5/8
9/64
25/64
What does the expected value (mean) of a random variable represent?
The average of all possible values, weighted by their probabilities.
The spread or dispersion of the variable's values.
The most frequent value the variable takes on.
The probability of the variable taking on a specific value.
For a standard normal distribution (mean 0, standard deviation 1), what does the CDF tell you at the value 0?
The probability of observing a value less than or equal to 0.
The probability density at the exact center of the distribution.
The probability of observing a value of exactly 0.
The most frequent value in the dataset.
In a survey of 100 people, 60 like coffee and 40 like tea. What is the empirical probability that a randomly selected person likes coffee?
0.4
0.6
Cannot be determined
You roll a fair six-sided die. What is the probability of rolling a number greater than 4?
1/6
1/3
1/2
2/3
What does the addition rule of probability calculate?
Probability of one event AND another event occurring
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
A basketball player makes 80% of her free throws. What is the probability that she makes her first free throw on her third attempt?
0.008
0.16
0.032
0.8
In a standard deck of 52 cards, you draw one card. What is the probability of drawing a heart or a spade?
1/4
1/13
1/52
If a random variable X follows a standard normal distribution, what is P(X = 0)?
Cannot be determined.