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The following table gives heights of boys and girls studying in a college.Find (i) Standard deviation of the heights of boys and girls taken together, (ii) Whose heights are more variable.

(a) Find the class intervals if the arithmetic mean of the following distribution is 33 and assumed mean 35:

(b) "Statistics is a bundle of lies". Comment.

From the marks obtained by 8 students in Accountancy and Statistics,compute rank coefficient of correlation:

Solve the following transportation problem whose cost matrix, availability at each plant and requirements at each warehouse are given as follows:

A company has to assign four workers A, B, C and D to four jobs W,X,Y and Z. The cost matrix is given below:

Suggest an optimal assignment schedule and the total cost pertaining thereto.

Solve the LP problem using simplex method:

(a) Write the dual of the following linear programming problem:

(b) What are the characteristics of dual problem and what are its advantages?

"Statistics is the science of estimates and probabilities". "Elucidate the above statement and a more comprehensive definition of the science of statistics.

(a) Compute the regression coefficient of Y and X from the following data:

(b) If two regression coefficients are -0.9 and -0.3, what would be the value of the coefficient of correlation?

a) Based on the frequency distribution given below, .compute the following statistical measures to characterise distribution.

i) Co-efficient of variation

ii) Inter-quartile range

iii) Modal value

What are averages? Calculate the mean and median for the following frequency distribution

n:

a) The following data relate to the price and supplies of a commodity during a period of eight years

Calculate the coefficient of correlation between the two series;

b) What is regression? Why are there, in general, two regression lines? Under what conditions can there be only one regression line?

a) Does the correlation coefficient imply 'causation' between two variables?

b) What is Rank Correlation? State merits and demerits of Spearman's Rank Correlation method.

An animal feed company must produce 200 kg of mixture consisting of ingredient X_{1} and X_{2} daily. X_{1} costs Rs. 3 per kg and X_{2} costs Rs. 8 per kg. Not more than 80 kg of X_{1} can be used and at least 60 kg of X_{2} must be used. Find out how much of each ingredient should be used if the company wants to minimize the cost.

a) Find the dual of

Maximize Z= 4x_{1}+x_{2}+7x_{3}

Subject to the constraints

b) Explain the following in brief:

i) Slack variable

ii) Surplus variables

iii) Shadow prices

Four Operators 0_{1}, O_{2}, O_{3} and O_{4} are available to a manager who has to match four jobs J_{1}, J_{2}, J_{3}, J_{4} done by assigning one job to each operator. The time needed by different operators for different jobs is given below.

i) How should the manager assign the jobs so that the total time needed for all jobs is minimum?

ii) If job J_{2} is not to be assigned to operator O_{2}. What should be the assignment and how much additional total time will be required?

A company has three factories at A, B and C which supply to warehouses at D,E,F and G respectively. Monthly production capacities of these factories are 250, 300 and 450 units respectively. warehouse requirements are 200, 225, 275 and 300 units, respectively. The current Unit transportation costs (in Rupees) from factories to warehouses are as follows:

Determine the optimum distribution for this company, to minimize cost.

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