TUESDAY:  24 November 2020.

Time Allowed: 3 hours.

Answer any FIVE questions. ALL questions carry equal marks. Show ALL your workings.


1.           Outline four properties of linear functions.                (4 marks)

2.          The following quadratic function is provided:

y     =     3×2 — 7x + 2


Plot the quadratic function curve within the limits (6 marks)

Solve the equation 3×2 — 7x + 2 = 0 using the graph plotted in (b) (i) above.                      (1 mark)

Solve the equation 3×2 — 7x — 2 = 0 using the graph plotted in (b) (i) above.                      (1 mark)


3. Simplify:

(Total: 20 marks)



1.          A father shared out his property to his family members as follows:

  • Son received % of the total.
  • Daughter received 1/3 of the total.
  • Wife received % of the remainder.
  • Younger brother and sister shared the balance in the ratio of 3:4 respectively.


If the younger brother received Sh.227,500, calculate the share of each beneficiary.                                                       (6 marks)

A tourist visiting East Africa had 30,000 Swiss Francs. While in Kenya, he converted the Swiss Francs into Kenya Shillings and made the following payments:

  • Paid transaction fees at 2%.
  • Bought a Kenyan necklace for 3 US dollars.
  • Bought a Kenyan basket for 40 Sterling pounds.

Before leaving for Uganda, he converted the remaining currency into Uganda shillings.

The following rates were applicable during the visit:

1 Swiss franc           =  Ksh.108.78.

1 US dollar              =  Ksh.103.50.

1 Sterling pound      =  Ksh.126.

1 Kenya shilling       =  Ugsh.35.


The amount received in Uganda shillings.                                                                                                                                  (5 marks)

3.          A retailer bought second-hand shirts at a cost of Sh.6,120 per dozen. She later sold all the shirts at a 20% mark-up

before allowing for a trade discount of 10% on the marked price of each shirt.


The marked price of each shirt.                                                                                                                                                   (4 marks)

4.            A farmer estimates that he needs 12 tractors to plough a piece of land in 15 days if he starts the work immediately.


The number of tractors required to complete the work on time assuming that there is a delay of 5 days in starting the work. (3 mark)

The number of days required to complete the work assuming that the original numb& of tractors is reduced by a third.    (2 marks)

(Total: 20 marks)



1.           Outline two advantages of bar charts as a method of representing data.                                                                              (2 marks)

2.          Highlight four sources of secondary data.                                                                                                                                   (4 marks)

3.          The following table shows the length of 40 metal rods from a manufacturer recorded to the nearest millimetre (mm):


149                    138                     164                     150                     132                     144                     125                               157

152                    146                     158                     140                     147                     136                     148                               144

154                    168                     126                     138                     176                     163                     119                                165

140                    146                     173                     142                     147                     135                     153                                135

145                    161                     145                     135                     142                     150                     156                                128



A frequency distribution table using class intervals of 5mm                                                                                       (6 marks)

A histogram and frequency polygon depicting the distribution of the length of the rods.                                           (8 marks)

(Total: 20 marks)



1.          Summarise two advantages and two disadvantages of the mode as a measure of central tendency.                        (4 marks)

2.         The distribution of daily wages (in shillings) of 200 workers in a certain farm is as follows:


Monthly wages (Shillings)         150— 220        220— 290         290— 360         360— 430         430— 500         500— 570

Number of workers                            24                      50                      64                      30                      20                      12



The mean daily wage.                                                                                                                                                 (2 marks)

The modal daily wage.                                                                                                                                                (3 marks)

The median daily wage.                                                                                                                                              (3 marks)

The standard deviation of the daily wages.                                                                                                                 (3 marks)

3.          A motor vehicle that costs Sh.820,000 is depreciated using the reducing balance method to a scrap value of Sh.215,000 within a useful life of 6 years.


The annual rate of depreciation of the motor vehicle using the logarithm method.                                  (5 marks)

(Total: 20 marks)



1.          In the year 2019, George Ratemo earned a salary of Sh.456,000 plus a house allowance of 15% of the salary and a medical allowance of Sh.5,500 per month. He was also entitled to a personal tax relief of Sh.14,400 per annum.

The following taxation rates were applicable for the year 2019:

Annual income                                        Tax rate


On the first Sh.129,900                                    10

On the next Sh.125,000                                   15

On the next Sh.125,000                                   20

On the next Sh.125,000                                   25

On all income over Sh.504,900                       30



Total taxable income for the year 2019.                                 (2 marks)

The total tax payable by George Ratemo for the year 2019.                                 (6 marks)

Net salary for the year 2019.                                (2 marks)


2.          Find the following integrals:


3.           It costs a tailor Sh.26,000 to make  12 pairs of trousers and 8 shirts. The cost of making 5 pairs of trousers and 11 shirts is Sh.18,500. The tailor makes a profit of 30% and   20% on the cost of a pair of trousers and a shirt respectively.


The cost of making a pair of trousers and a shirt using matrix algebra.                                 (4 marks)

The selling price of a pair of trousers and a shirt.                                 (2 marks)

(Total: 20 marks)



1.          Define the following terms as used in probability:

Event.                                 (2 marks)

Experiment.                                 (2 marks)

Outcome.                                 (2 marks)

2.          Macz Limited intends to employ some workers to address its staffing needs. The candidates were taken through all the three stages of an interview. Out of the 800 candidates who were interviewed, the following failed the interview at the stated stages. 80 at stage 1, 72 at stage 2 and 36 at stage 3.


Represent the above information in a tree diagram.                (3 marks)

The probability that a randomly selected candidate will pass all the three stages of interview.                (2 marks)

Approximate the number of candidates that should be interviewed in order for 120 candidates to successively pass all the three stages of the interview.                                                                                                                                                                                                   (2 marks)

3.          In an arithmetic progression, the thirteenth term is 27 and the seventh term is three times the second term.


The first term.                                                                                                                                                             (3 marks)

The common difference.                                                                                                                                           (1 mark)

Sum of the first ten terms.                                                                                                                                       (3 marks)

(Total: 20 Marks)



1.          Find the value of the following:

2.          Johnstone Odera wishes to invest and accumulate Sh.5,000,000 at the end of five years. The compound interest rate being offered by Faidika Bank is 20% per annum.


The initial amount that should be invested in order to accumulate the projected amount.                                                            (3 marks)


3.           Differentiate the following functions:


4.          Solve the following simultaneous equations using the elimination method:


3x+ 2y       =    106

2x + 4y      =    92                                             (4 marks)


5.           Solve the following equation:

(Total: 20 marks)

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