ID

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ID

NAME

MARKS

IUBAT–INTERNATIONAL UNIVERSITY OF BUSINESS AGRICULTURE AND TECHNOLOGY Final examination

STA 240

Full marks: 100

Time: 3 hours

1.

Which measure of central tendency is the best? Why?

(3)

2.

Find the mean and mode for the series 1, 2, 3 ……… 700.

(5)

3.

Two dice are rolled; find the probability that the sum is equal to 7.

(10)

4.

Find the two numbers whose AM=10 and GM=8.

(10)

5.

Which measure of dispersion is the best? Why?

(3)

6.

Find the MD and SD of the numbers 1, 2,3,4,5.

(10)

You may use the following formulas n

SD

MD

X

i

X

i 1

n 7.

In what situations, HM and GM are not applicable?

(3)

8.

Find the two numbers whose AM=7 and SD=1.

(10)

9.

Write down the applications of Poisson distribution.

(3)

10.

Explain the concept of systematic sampling with an example.

(3)

11.

f(x)=x5 ; 0<x<1

(10)

a) Find E(X). b) Find V(X). 12.

Why we study coefficient of variation (CV)?

(3)


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