# What is the expected value of the sum of two dice?

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The expectation of the sum of two (independent) dice is the sum of expectations of each die, which is 3.5 + 3.5 = 7. Similarly, for N dice throws, the expectation of the sum should be N * 3.5. If you’re taking only the maximum value of the two dice throws, then your answer 4.47 is correct.

## How do you find the expected value of a dice?

The expected value of the random variable is (in some sense) its average value. You compute it by multiplying each value x of the random variable by the probability P(X=x), and then adding up the results. So the average sum of dice is: E(X) = 2 . 1/36 + 3 . 2/36 + ….

## What is the expected value of a sum?

The expected value of the sum of several random variables is equal to the sum of their expectations, e.g., E[X+Y] = E[X]+ E[Y] . On the other hand, the expected value of the product of two random variables is not necessarily the product of the expected values.

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## What is the expected value of the max of two dice?

the maximum value that one dice can reach is 6. So for two dice together it would be 12 (aka 6+6). I think that’s what you mean by the question.

## What is the expected value of the sum of three dice?

Rolling three dice would give you an expected outcome of 10.5. (It may be interesting to note that the expected value is an impossible occurrence, since dice have a whole number of dots.

## What is the sum of two dice?

If you’re rolling two standard 6 sided dice, their sum will be between 2 and 12, with an average of 7. There are 36 possible combinations {(1, 1), (1, 2), … (2, 1) … (6, 6)} resulting in a total of 11 different sums.

## How do you find the expected value of two dice?

The expectation of the sum of two (independent) dice is the sum of expectations of each die, which is 3.5 + 3.5 = 7. Similarly, for N dice throws, the expectation of the sum should be N * 3.5. If you’re taking only the maximum value of the two dice throws, then your answer 4.47 is correct.

## What is expected value in math?

Expected value is a measure of central tendency; a value for which the results will tend to. When a probability distribution is normal, a plurality of the outcomes will be close to the expected value. … It can have many (or infinite) possible outcomes, and each outcome could have different likelihood.

## What is an expected value in statistics?

The expected value (EV) is an anticipated value for an investment at some point in the future. In statistics and probability analysis, the expected value is calculated by multiplying each of the possible outcomes by the likelihood each outcome will occur and then summing all of those values.

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## What is the expected value of M quizlet?

The expected value of M is the mean of the distribution of sample means (μ). c. The standard error of M is the standard deviation of the distribution of sample means (σM = σ/n).

## How many combinations are there with 2 dice?

When two dice are rolled, there are now 36 different and unique ways the dice can come up. This figure is arrived at by multiplying the number of ways the first die can come up (six) by the number of ways the second die can come up (six). 6 x 6 = 36.

## What is the probability of getting a sum of 12 when rolling 3 dice simultaneously?

Probability of a sum of 12: 25/216 = 11.6% Probability of a sum of 13: 21/216 = 9.7% Probability of a sum of 14: 15/216 = 7.0%

## What is the probability of rolling a sum of 8?

There are 36 outcomes in total. Five of them (2,6), (3,5), (4,4), (5,3) and (6,2) result in sum 8. So, assuming all outcomes are equiprobable, the answer is 5/36.