Important of Statistics

Kinds of statistical averages:

• Mathematical average

• Positional average

• Commercial average

• All of the above

Disadvantage of range is:

• Uncertain measures

• Unstable measures

• It doesn't give the knowledge about the structure of the series

• Unfair estimate of frequency distribution

• All of the above

Main uses of range is:

• Statistical quality control

• Weather forecasting

• Fluctuations in the prices of commodities, stock and shares.

• All of the above

Advantages of Range :

• Easy calculation

• Knowledge of limit

• All item values are not required

• Useful in quality control

• All of the above

Coefficient of range is calculated by:

• L-s

• L+S

• L-S/L+S

• All of the above

Range is calculated by

• L-S

• S-L

• L-s/L+S

• None of these

Methods of measuring can classified into the ways:

• Methods of limit

• Methods of averaging deviation

• Graphic method

• All of the above

Characteristics in a good measure of Dispersion is:

• It should be based on all items values

• It should be rigidly defined

• It should be easy to calculate

• All of the above

median of the following is

100,150,80,90,160,200,140

• 140

• 124

• 138

• 140.4

Methods of calculating simple average or mean is:

• Direct method

• Short cut method

• Step deviations method

• All of the above