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3 cards from this section. Quick, good the night before a test.
What condition must the probabilities in a discrete probability distribution satisfy?
Think of the total probability rule.
Define expected value in your own words.
Consider it as the center of a probability distribution.
What is the expected value of a fair six-sided die?
Recall the average of all possible outcomes.
True or False: The probabilities in a discrete distribution can add up to more than 1.
Think of the total probability.
There's a two-sided die where one side shows a number from 1 to 10, weighted towards higher numbers. Determine the expected value if the weights are P(1)=0.05, P(2)=0.05, P(3)=0.1, P(4)=0.1, P(5)=0.1, P(6)=0.15, P(7)=0.1, P(8)=0.1, P(9)=0.1, P(10)=0.05.
Use the same method of calculating expected values we've practiced.
A store has a 30% chance of selling 1 shirt, 50% chance of selling 2 shirts, and 20% chance of selling no shirts over a weekend. Calculate the expected sales and the variance.
Remember the steps we went through to find variance!
6 more questions in this section. Enroll free to practise them all.
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