# Business Calculations _ Statistics 2018 November Knec Past Paper SECTION A (40 marks)
Answer ALL the questions in this section
The cost price of a computer is Ksh. 5.000 more (han the cost price of a printer. The total cost of the two items is Ksh. 22.000. Calculate the cost of the computer. (2 marks)
John paid a total of Ksh. 4,820 on the bills for electricity and water. The amount paid tor water bill was -J- of the amount paid for electricity bill Determine the amount paid for water bill. (2 marks)
A sales agent is paid 10% commission on the first Ksh. 100.000 of sales and 3% on sales above Ksh. 100,000. In the month of January 2018, his total sales were Ksh. 565,200. Determine his commission for the monih. (3 marks)
The Calue of a residential property is Ksh. 3.6 million. The property is insured al Ksh. 2 for every Ksh. 1.000. per month Determine the premium payable per annum. (2 marks)
A trader bought 100 calculators at Ksh. 775 each. He sold half of the calculators at Ksh. 950 each. He sold the remaining hall at a total of Ksh. 45,500. Determine the amount of profit that he made. (2 marks)
A television set (TV) is sold on hire purchase terms. A deposit of Ksh. 15,000 is required and the balance is paid in 15 monthly instalments of Ksh. 5,000. Calculate the hire purchase price of the TV set. (2 marks)
State two qualities of a good measure of central tendency, (2 marks)
A business lady bought 30 handbags at a cost of Ush. 77, 500 each in Uganda. Determine the total cost of the handhags, in Kenya shillings.
Take ! Ksh = Ush 31. (2 marks)
Determine the values of the next two terms in the following sequence: 128,32.8.w (3 marks)
State two uses of index numbers. (2 marks)
Integrate the following function: / (4|J
r- 3x’ + 1 )<tr. (1 mark)
Differentiate between the terms, discrete series and continuous series, as used in the classification of data. (2 marks)
The weekly production of departments A, B and C of a firm are 50,000 units, 48,000 units and 72.800 units, respectively. Present this information in a pic chart. (2 marks)
Outline two uses of statistics in a business organization. (2 marks)
The sales by a fruit vendor for six days were;
Ksh. 540. Ksh. 470. Ksh. 380. Ksh 600. Ksh. 560 and Ksh 430.
Determine the median sales for the week. (2 marks)
16. The correlation coefficient between two variables is given as: r – 0.92. Interpret this value of r, (1 mark)
17. A department in a firm is producing two separate independent products. The probability that either of the products will be completed on time is 0.4. Determine the probability drat just one product will be completed on time. (2 marks)
18 A businessman invested Ksh. 680,000 in a hank that pays a compound interest at the rate of 12% per annum. Determine the amount in his account at the end of 4 years, if compound interest is paid senjoannually. (2 marks)
19. The marked price of a bicycle is Ksh. 5,000. Peter paid Ksh. 4,500 after he was allowed a trade discount.
Calculate the percentage of trade discount allowed to Peter, (2 marks)
20. Distinguish between the terms, range and skewness, as used in measures of dispersion.
SECTION B (60 marks)
Answer ALL the questions in this section.
21, (a) Explain four methods that are used to collect primary data. {8 marks)
(b) The table below shows prices and quantities of food items in a region for the years 2006 and 2016, respectively  Where x is quantity produced and sold, in hundreds of units. Determine the level of production that maximises total revenue. (8 marks)
t b) Explain four limitations of using statistics in business. (8 marks)
24. (a) Grade A tea oasts Ksh. 120 per kg while Grade B tea costs Ksh. 165 per kg. The two grades of tea arc mixed to produce a mixture that sells al Ksh. 180 per kg. The profit on selling the mixture is 25%. Determine the ratio at which the two grades of tea are mixed.

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