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Q: What is the mean and variance of throwing unbiased dice?
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What does it mean to say that the sample variance provides an unbiased estimate of the population variance?

It means you can take a measure of the variance of the sample and expect that result to be consistent for the entire population, and the sample is a valid representation for/of the population and does not influence that measure of the population.


When 2 dice are tossed simultaneously the mean and variance of the sum of all dots on the turned-up faces can be determined?

Yes, quite easily.


What are the properties of z in a normal distribution?

Z is a variable with mean 0 and variance 1.Z is a variable with mean 0 and variance 1.Z is a variable with mean 0 and variance 1.Z is a variable with mean 0 and variance 1.


What does variance mean in mathematics?

A variance is a measure of how far a set of numbers is spread out around its mean.


Can variance be negative?

Since Variance is the average of the squared distanced from the mean, Variance must be a non negative number.


When a coin is tossed four time then mean and variance of the number of the head?

Mean = 2. Variance = 1.


Is variance based on deviations from the mean?

Variance is the squared deviation from the mean. (X bar - X data)^2


How do you do variance?

you have to first find the Mean then subtract each of the results from the mean and then square them. then you divide by the total amount of results and that gives you the variance. If you square root the variance you will get the standard deviation


What does it mean when dice is written over dice?

A pair of dice, or "paradise".


A fair coin is tossed 10 times what are the expected mean and variance of the number of heads?

mean = 5, variance = 5


What is the sample variance with the mean of 190.3?

The mean, by itself, does not provide sufficient information to make any assessment of the sample variance.


How is standard deviation found?

Formally, the standard deviation is the square root of the variance. The variance is the mean of the squares of the difference between each observation and their mean value. An easier to remember form for variance is: the mean of the squares minus the square of the mean.