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What are the advantages of weighted average?
More importance can be attached to observations which are either of greater importance, accuracy (lesser variance).
What does it mean if a number occur more than once in a row of a stem-and-leaf plot?
All it means that there were more than one observations which had the same value.
What the meanig of the decimal point?
The decimal point is used to show that the number is not whole. Numbers after the decimal point show fractions of the number so there is more accuracy.
Are sample means more variable than individual observations Are sample means more skewed than individual observations?
No, to both questions.
Is there ever more than one median?
No, there is never more than one median in a data set. The median is defined as the middle value when the data is arranged in order. If the data set has an odd number of observations, the median is the single middle value. If it has an even number of observations, the median is the average of the two middle values, which also results in a single value.
