Commerce (English Medium) इयत्ता ११ - CBSE Question Bank Solutions for Economics

What is a variable?

Distinguish between a discrete and a continuous variable.

A measure of dispersion is a good supplement to the central value in understanding a frequency distribution. Comment.

Which measure of dispersion is the best and how?

Some measures of dispersion depend upon the spread of values whereas some are estimated on the basis of the variation of values from a central value. Do you agree?

If in the previous question, each worker is given a hike of 10 % in wages, how are the mean and standard deviation values affected?

The average daily wage of 50 workers of a factory was Rs 200 with a standard deviation of Rs 40. Each worker is given a raise of Rs 20. What are the new average daily wage and standard deviation? Have the wages become more or less uniform? 

The yield of wheat and rice per acre for 10 districts of a state is as under:

Calculate for each crop, 

Range

The yield of wheat and rice per acre for 10 districts of a state is as under:

Calculate for each crop, 

Compare the values of different measures for each crop.

The yield of wheat and rice per acre for 10 districts of a state is as under:

Calculate for each crop, 

Q.D.

The yield of wheat and rice per acre for 10 districts of a state is as under:

Calculate for each crop, 

Mean deviation about Mean

The yield of wheat and rice per acre for 10 districts of a state is as under:

Calculate for each crop, 

Mean deviation about Median

The yield of wheat and rice per acre for 10 districts of a state is as under:

Calculate for each crop, 

Standard deviation

Calculate the mean deviation using mean and Standard Deviation for the following distribution.

In a town, 25% of the persons earned more than Rs 45,000 whereas 75% earned more than 18,000. Calculate the absolute and relative values of dispersion.

The sum of 10 values is 100 and the sum of their squares is 1090. Find out the coefficient of variation.

The yield of wheat and rice per acre for 10 districts of a state is as under:

Calculate for each crop, 

Which crop has greater variation?

In the previous question, calculate the relative measures of variation and indicate the value which, in your opinion, is more reliable.

A batsman is to be selected for a cricket team. The choice is between X and Y on the basis of their scores in five previous tests which are:

Which batsman should be selected if we want,

1. a higher run-getter, or
2. a more reliable batsman in the team?

To check the quality of two brands of lightbulbs, their life in burning hours was estimated as under for 100 bulbs of each brand.

Which brand gives higher life?