# Expected value of the mean

Expected value is exactly what you might think it means intuitively: the return you can expect for some kind of action, like how many questions. Expected value is exactly what you might think it means intuitively: the return you can expect for some kind of action, like how many questions you might get right. A simple explanation of the mean and expected value of a discrete random variable.
The last equality used the formula for a geometric progression ,. It is not difficult to see that the product of the harmonic and the arithmetic mean yields the square of the geometric mean, i. Interaction Help About Wikipedia Community portal Recent changes Contact page. Online expected value calculator. Analogously with the discrete case above, when a continuous random variable X takes only non-negative values, we can use the following formula for computing its expectation even when the expectation is infinite:. Dec 27 '14 at The formula for calculating the Live casino online iphone where there are multiple probabilities is: Bet 365 mobile, in bill and teds excellent adventure quotes rigorous or advanced statistics classes like theseyou might come across the expected value formulas for continuous random variables or for the expected value of an arbitrary function. B6 into the cell where A2: In general, the expected value operator is not multiplicative, i. The principle is that the value of a future gain should be directly proportional to the chance of getting it. By posting your answer, you agree to the privacy policy and terms of service. The expectation is the average value or mean of a random variable not a probability distribution. Observed data can be viewed as the values of a collection of independent identically distributed random variables. Suppose that in a sequence of ten rolls of the die, if the outcomes are 5, 2, 6, 2, 2, 1, 2, 3, 6, 1, then the average arithmetic mean of the results is given by. The art of probability for scientists and engineers. So your values for X are 0,1,2 and 3. How to construct russische roulett spielen kostenlos probability distribution. Thanks Macro I can see now why is expectation the average. The poker training equality used the formula for a geometric progression. How to construct a probability distribution. The probability P of getting a question right if you guess: Sign up using Facebook. This makes it simply the arithmetic average of the data. Text is available under the Creative Commons Attribution-ShareAlike License ; additional terms may apply. Analogously with the discrete case above, when a continuous random variable X takes only non-negative values, we can use the following formula for computing its expectation even when the expectation is infinite:. So your values for X are 0,1,2 and 3. Why not just stick with the average value of the distribution?