Description
TUTOR MARKED ASSIGNMENT
Course Code : ECO-07
Course Title : ELEMENTS OF STATISTICS
Assignment Code : ECO-07/TMA/2023-24
Coverage : ALL BLOCKS
Maximum Marks: 100
Attempt all the questions:
Q.1 a) Calculate the standard deviation and variance from the following data:
x 10 12 14 16 18 20 22
f 3 5 9 16 8 7 2
b) What is coefficient of variation? What is its role as a measure of
variation?
(10+10)
Q.2 What is sampling? Explain various methods of sampling? Why sample
survey is preferred compared to census survey? Explain.
(20)
Q.3 Describe the problems that are usually confronted by the investigator when
he decides to collect primary data. Explain various methods of collecting
primary data and also narrate their merits and demerits.
(20)
Q.4 a) A motorist travelled for three days at the rate of 480 km. a day. On the
first day he travelled for 10 hours at a speed of 48 km per hour, on the
second day he travelled for 12 hours at a speed of 40 km. per hour and
on the third day for 15 hours at a speed of 32 km. per hour. What was
his average speed?
b) Calculate the arithmetic mean for the following data by using the two
methods of Arithmetic mean for Discrete Series:
Marks 10 20 30 40 50 60 70 80
No. of
students
8 21 23 17 15 9 5 2
(10+10)
Q.5 Write short notes on the following:
a) Median
b) Negative skewness
c) Sampling errors
d) Objectives of classification
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