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5 cards from this section. Quick, good the night before a test.
What is the expected value of a single toss of a fair coin?
Consider the values head and tails represent.
For a die roll with outcomes from 1 to 6, what is E(X)?
Use the average of all die outcomes.
What is the expected value of rolling a fair 6-sided die?
Think about how often each number occurs.
True or False: The expectation of a constant is the constant itself.
Consider what happens if the random variable was always that constant.
In a city, the probability distribution of daily rainfall events can be described by a discrete random variable. If E(X) = 2 inches, how do you interpret this in practical terms?
Think about how this relates to planning activities.
For a random variable X with a uniform distribution from 1 to 5, find the variance and relate it to the mean.
Use the variance formula for uniform distributions.
5 more questions in this section. Enroll free to practise them all.
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