Discrete Probability Distributions

Front

What is a discrete random variable?

Back

A discrete random variable is a variable that can take on a countable number of distinct values, often representing counts of items or occurrences.

Front

Classify the following: The number of cheeseburgers a fast-food restaurant serves each day.

Back

Discrete

Front

Which of the following is a discrete random variable? Sam's height, Sam's weight, Time Sam's runs the 110 m hurdles, Amount of Sam's brothers and sisters.

Back

Amount of Sam's brothers and sisters

Front

What is the relationship between standard deviation (s.d.) and variance?

Back

Front

What do all probabilities in a probability distribution add up to?

Back

1

Front

How do you calculate the mean of a discrete probability distribution?

Back

Sum of all values multiplied by their probabilities.

Front

What is the variance of a discrete random variable?

Back

Variance measures the spread of a set of values in a probability distribution.

Front

What is the formula for variance in a discrete distribution?

Back

Front

What is the expected value of a discrete random variable?

Back

The expected value is the long-term average value of repetitions of the experiment it represents.

Front

How do you find the expected value of a discrete random variable?

Back

Multiply each possible value by its probability and sum the results.