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Guru Gobind Singh Indraprastha Vishwavidyalaya 2012 B.B.A Qtor - exam paper

Tuesday, 28 May 2013 08:45Web

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Manaraja Agrasen institute or ivianagemeni studies First Internal Examination 2^nd Semester - BBA (Gen), B&I Subject - QTOR, Subject code -106

Time:2 hrs

Note: Attempt all questions. All questions carrying equal marks.

Q1 Define Statistics. What are the scope and limitations of statistics? Jjonsider the following distribution

Wages	Frequencies	Wages	Frequencies
0-10	12	40-50	?
10-20	18	! 50 20	25
20-30	. ?	60-70	1&
30-40	40	Total	170

The median of the following wage distribution is known to be Rs. 35. The frequencies from the table are missing. Find these missing values.

c/fhe numbers 3.2, 5.8, 7.9 and 4.5 have frequencies x, x+2, x-3, and x+6 respectively. If arithmetic mean is 4.876. Find the value of

Q2. For 10 observations on price X and supply Y, the following data are ofeined.

SXY = 3467, =130, X2288, Y =220,1 f² - 5504

(JbtaiiTthe line of regression of y on x and x ci: y. Also estimate the supply when the price of 16 units.

OR

jThe line of regression of marks in Statistics (X) cn marks in Accountancy (Y) for class of

50 students is:

Average marks.in Accountancy is 44 and variance of marks is 9/16 of variance of marks in Accountancy. Find:

i. The average marks in Statistics.

ii. Coefficient of corrdatic" between marks in Statistics and Accountancy.

fffical-mlate the coefficient of variance of th; following data.

\.

Marks	No. of 5iuder\ts	Marks	No. of students
More than 20 ~¹	70	More than 50	*4 O CO i
More than 30 rc,	63 f	More than 80	\|oo
More than 35	55 If	More than 65	10 J
More than 40..	40 p	More than 70	7 1
		More tii.n 80	0 -t>

^0R

The arithmetic mean ax i standard deviation of series of 20 items were calculated as 20 and 5 cm. But while calculating 13 was misread as 30, Find correct mean and correct standard deviation.