ECO-07 SOLVED ASSIGNMENT 2018-19
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 15 25 30 – 30 20
students
Arithmetic mean of marks is 44.
(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 2 3 8 9 10
Companies
4. Calculate mean and standard deviation from the following distribution: (20)
Class 10-20 20-30 30-40 40-50 50-60 60-70 70-80
Interval
Frequency 2 4 4 8 6 3 2
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