Relative Frequencies + Discrete Variables (Q1a)
Most Chapter 7 textbook exercises give you a complete probability distribution to work from. Easy! What if you are presented only with frequencies and have to construct your own distribution? This happens on test questions. In this video I show you how to handle them.
Probability Distribution: a table, formula, or graph that describes the values of a random variable and the probability associated with these values
A discrete probability distribution has two components:
- Each possible value of X is listed
- The probability of each X occurring, P(x), is also listed
Discrete probability distributions are typically presented as tables. A simple example:
The probability of each X occurring, P(x), is equal to the frequency of that X, fx, divided by the total number of observations (n)
Test your understanding:
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Question 1 of 2
1. Question
A table, formula, or graph that shows all possible values a random variable can assume, together with their associated probabilities, is called a(n):
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Question 2 of 2
2. Question
A deck of 52 cards has four suits: hearts, spades, diamonds, and clubs. There are 13 cards in each suit. You draw one card at random from the deck. What is the probability it’s a heart?
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