# Bihar Yoga Bharati 2009 B.Ed Business mathematics - Question Paper

BUSINESS MATHEMATICS & STATISTICS - (S-203)

STAGE . 2

**Time Allowed ****. ****2 Hours 45 Minutes
Maximum Marks ****.
****80**

(i) Attempt ALL questions.

(ii) Answers must be neat, relevant and brief.

(iii) In marking the question paper, the examiners take into account clarity of exposition, logic of arguments,

effective presentation, language and use of clear diagram / chart, where appropriate.

(iv) Read the instructions printed on the top cover of answer script CAREFULLY before attempting the paper.

(v) Use of non-programmable scientific calculators of any model is allowed.

(vi) DO NOT write your Name, Reg. No. or Roll No. anywhere inside the answer script.

(vii) Question No.1 . .Multiple Choice Question. printed separately, is an integral part of this question paper.

**SECTION ****.****A****. ****Marks**

**Q.2 (a) **Solve the following system of
equations by Gaussian Elimination Method:

x + 2y = 5

x . z = .15

.x + 3y +2z = 40 08

**(b) **Solve the equation 4x2 +18x . 10 = 0 by
factorization. 04

**(c) **Find the equation of the straight line, which
passes through the point of intersection of

the lines 2x + 4y = 20 and 3x + y = 10 and is perpendicular to the line 5x . 2y = 20. 08

**Q. 3 (a) **Find the derivative of the following
function:

f(x) = e **2x + 5 **(4x**2 **. 5x + 4)**4 **04

**(b) **A company specializing in a mail-order sales
approach is beginning a promotional

campaign. Advertising expenditure will cost the firm Rs.5,950 per day. Specialists

estimate that the rate at which profit (exclusive of advertising costs) will be generated

from the promotion campaign decreases over the length of the campaign. Specifically,

the rate **r(****t****) **for this campaign is
estimated by the function:

**r(****t****) = ****. ****50 ****t****2 ****+ 10,000**

Where .**t**. represents the day of the campaign and **r(t) **is measured in rupees
per day.

In order to maximize the net profit, the firm should conduct the campaign as long as

**r(****t****) **exceeds the daily expenditure cost.

**Required:**

(i) How long should the campaign be conducted to achieve the above objective?

(ii) What are the total advertising expenditures expected to equal during the

campaign?

(iii) What will be the expected net profit?

03

02

03

**(c) **The nominal interest rate of investment is
14% per year. Determine the effective

interest rate, if interest is compounded bi-monthly. 02

**(d) **Suppose a dropped ball always rebounds
one-half the height it falls. If it is dropped

from a height of 64 meters, how far will have it traveled when it reaches the top of the

fifth bounce? 06

PTO

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**SECTION ****.****B****. ****Marks**

**Q. 4 (a) **The income distribution of 100
families is given below:

**Income **0 . 25 25 . 50 50 . 75 75 - 100 100 -
125 125-150

**No. of families **18 - 25 - 14 18

Mode of the given distribution is 60. Find out the missing frequencies? 05

**(b) **Find Fisher.s Ideal index number of the year
2005 for the following data: 05

**Commodity Price (Rs.) Qty (units)**

**Year ****2000 ****Year ****2005 ****Year ****2000 ****Year ****2005**

A 12.50 15.00 125 150

B 30.00 40.00 160 185

C 75.00 85.10 140 165

D 95.15 105.00 78 85

E 125.00 140.00 65 50

F 155.10 170.35 45 63

**Q. 5 **Random samples of size two are drawn from the
finite population 2, 4, 6 and 8 with

replacement.

**(a) **Construct sampling distribution of mean. 04

**(b) **Verify that

m*x *= m and s*x *=s / *n*

06

**SECTION ****.****C****.**

**Q. 6 **A particular project comprises 12 activities,
which have the following durations and

preceding activities:

**Activity Duration (days) Immediately
preceding activities**

A 3 -

B 5 A

C 7 L

D 2 L

E 9 -

F 6 B, C

G 5 E

H 6 B, C

I 3 A

J 4 I

K 4 D, F

L 4 -

**Required:**

**(a) **Represent the project by means of a network
diagram. 05

**(b) **Show the earliest and latest times for each
activity. 04

**(c) **Determine the critical path and minimum
completion time of the project. 01

**Q. 7 **Solve the following linear programming model
by using simplex method. 10

Maximize z = 10x + 12y

Subject to x + y ≤ 150

3x + 6y ≤ 300

4x + 2y ≤ 160

x , y ≥ 0

**THE END**

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Earning: Approval pending. |