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Attitudes and Appearances
For some values, yes. For some values, no. For some people, yes. For some people, no. Every person, family and situation is different.
and it cannot take on values in between its distinct values. Examples of discrete variables include the number of children in a family, the number of cars in a parking lot, and the number of heads obtained when flipping a coin.
The weighted arithmetic mean is used, if one wants to combine average values from samples of the same population with different sample sizes: : The weights wi represent the bounds of the partial sample. In other applications they represent a measure for the reliability of the influence upon the mean by respective values. rhinostar
It cannot be used for qualitative data. The mean is affected by extreme values. It may not be represented anywhere in the population - for example, in most places, the average number of children per family will be a mixed fraction. There are no fractional children, though!