ECO-07 Solved Assignment 2018-19
Course Code : ECO – 07
Course Title : ELEMENTS OF STATISTICS
Assignment Code : ECO – 07/TMA/2018-19
Coverage : All Blocks
Attempt all the questions.
1. What is sampling? Explain various methods of sampling? (20)
2. Differentiate between primary data and secondary data. Describe the factors that affect the
choice of data to be used in investigations. (20)
3. (a) Find the missing frequency from the following data. (10)
Marks 0-10 10-20 20-30 30-40 40-50 50-60
No. of
students
15 25 30 – 30 20
(b) Calculate mode from the data given below: (10)
Profit (Rs. In
Lakh)
0-5 5-10 10-20 20-30 30-50
No of
Companies
2 3 8 9 10
4. Calculate mean and standard deviation from the following distribution: (20)
Class
Interval
10-20 20-30 30-40 40-50 50-60 60-70 70-80
Frequency 2 4 4 8 6 3 2
5. Write short notes on the following. (4X5)
(a) Skewness
(b) Sampling and Non sampling
(c) Lorenz Curve
(d) Schedule and questionnaire
