# ECO-07 Solved Assignment 2017-2018

ECO-07 Solved Assignment 2017-2018 for FREE

Elective Course in Commerce
ECO – 07: ELEMENTS OF STATISTICS

For July 2017 and January 2018 admission cycle

Attempt all the questions.

1. What is statistical sampling and explain various methods of sampling.

2. “Statistical methods are most dangerous in the hands of the inexpert” Discuss with example.

3. (a) Find out missing frequencies in the following incomplete distribution:

 Measurement 0-10 10-20 20-30 30-40 40-50 Frequency 3 ? 20 12 ?

The values of Median and Mode are 27 and 26 respectively.

4. (a) Karl Pearson‟s coefficient of skewness of a distribution is +0.32. Its standard deviation is
6.5 and mean is 29.6. Find the mode and median of the distribution.
(b) The mean and standar deviation of a set of 100 observations were worked out as 40 and
5 respectively by a computer who by mistake took the value 5o in place of 40 for one
observation. Recalculate the correct mean and variance.
(c) Find the missing information from the following:

 Particulars Group I Group II Group III Combined Number 50 ? 90 200 Standard Deviation 6 7 ? 7.746 Mean 113 ? 115 116

(d) Distinguish between ‘U’ shaped and bell-shaped data with suitable illustrations.

5. Write short notes on the following:
(a) Dispersion
(b) Mean deviation
(c) Standard deviation
(d) Lorenz Curve

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