Is standard deviation a measure of center or a measure of variation ?
A. measure of center
B. measure of variation

The IQR is a type of resistant measure. The second measure of spread or variation is called the standard deviation (SD).

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Numerical MeasureSensitive MeasureResistant Measure

Measure of CenterMeanMedian

Measure of Spread (Variation)Standard Deviation (SD)Interquartile Range (IQR)

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Step-by-step explanation:

The answer is "B" which is the measure of variation

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Step-by-step explanation:

the one below it is a function

answer: 4  

the square root of 16 is 4. it is a very simple mathematic concept. a square root when a number multiplied by itself will result in a number. here, the number 16 comes when 4 is multiplied by 4. hence the square root of 16 is 4. you can always figure out a square root by the inverse operation of squaring.