KNEC KCSE Mathematics Paper 2 Question Paper / 2016 KCSE KAMDARA JET Examination

Using an assumed mean of 50 , calculate the standard deviation of the marks obtained in a test recorded as follows: 50, 52, 45, 40, 55, 51 56, 48, 55, 60

Make x the subject of the formula 

Find the value of x in the equation
Log₃ X – 4log_X3 = -3

a) Expand the binomial (2 – ¼ x)⁵(2 marks)
b) Using the first 4 terms of the binomial above solve for 1.755 (2 marks)

a) Find the inverse of the matrix  (1 mark)

b) Hence determine the point of intersection of the lines (2 marks)
x + y = 7
3x + y = 15

Rationalise the denominator and simplify the answer completely.

Solve for x in the trigonometric equation 4cos²x + 4sin² x = 16sin²xcos²x in 0^o ≤x≤360^o

The mass of a cylinder of a small material varies jointly as the square of the radius and as the
height. If the radius is increased by 20% and the height by 10%. Find the percentage increase in
mass. (3 marks)

Given that the dimensions of a rectangle are 20.0cm and 25.0. Find the percentage error in calculating the area.

Maina bought a new laptop on hire purchase. The cash value of the laptop was Ksh. 56,000. He paid a deposit of Ksh. 14,000 followed by 24 equal monthly installments of Ksh. 3500 each. Calculate the
monthly rate at which the compound interest was charged.

Find the equation of tangent to a curve x² = 4y+1 at the point (2, 0.75)

Object A of area 12cm² is mapped onto its image B of area 72cm2 by a transformation. Whose matrix is given by . Find the positive values of x.

In the figure below, AB is a tangent, meeting chord CDE at B. AD = 5cm, CD = 4cm, DF = 2cm, EB =
7.5cm and DE = x cm.

Determine:
(a) The value of x (1mark)
(b) The length of AB. (2 marks

A ship covers 60km on a bearing of 230^o. If then it changes course and heads due west for
80km, determine its direct distance from the starting point.

Find the centre and the radius of the circle whose equation is x² + y² – 7x + 6 + 11y = 0

The 2nd, 4th and 7th terms of A.P are the first 3 consecutive terms of a G.P. Find:
(a) The common ratio (2Marks)
(b) The sum of the first eight terms of the G.P if the common difference of the A.P is 2.
(2Marks)

In the figure above, M divides line OB in the ratio 1:2 and N divides  in the ratio 2:3  and 
intersect at X. Given  and 

a) Find in terms of a and b :
(i)  (1 mark)

(ii) (1 mark)

(iii) (1 mark)

b) If  and  where h and k are scalars

(i) Express  in two ways.

Hence find the value of h and k (4 marks)

c) Find the ratio of  (1 mark)

(i) Express OX in two ways. ( 2 marks)

The figure below shows a right pyramid with a rectangular base. The length of the rectangular base is
15cm and the width is 8cm. The slant edges are all equal to 20cm.

Calculate
a) The volume of the pyramid. (3 marks)
b) The angle VAB makes with ABCD (3 marks)
c) The angle plane XBD makes with VBD given that point X lies on VA such that VX: XA = 2: 3
(4 marks)

The number x is chosen at random from the set (0,3,6,9) and the number y is chosen at random
from the set (0,2,4,6,8). Calculate the probability of each of the following separate events.
(i) x > 6 (1 mark)
(ii) x + y = 11 (2 marks)
(iii) x > y (3 marks)
(iv) xy = 0 (2 marks)
(v) 10x + y < 34 (2 marks)

P and Q are two points on the same parallel of latitude 66o 251, whose longitudes differ by
120o. Calculate in kilometres. Radius of the earth =6370.

a) The radius of the parallel of latitude where P and Q lie. (2 marks)
b) The distance of P and Q measured along the parallel of latitude. (2 marks)
c) (i) find the length of the straight line joining PQ (2 marks)
(ii) Find the distance between P and Q along the same latitude in nautical miles. (2 marks)
(iii)If an aircraft took 30min to fly from P to Q, Calculate its speed in knots. (2 marks)

a) Use the trapezium rule to estimate the area between the curve y = 3x² + 1, lines x=1 and x=3
and x-axis. Use five ordinates. (5 marks)

b) Using integration method find the exact area under a curve y=3x² + 1 (3 marks)
d) Find the percentage error in estimating the area. (2 marks)

The table below shows the rate at which income tax is charged for all income earned in a month
in 2015.

A total of Ksh. 14,500 is deducted from Mrs. Momanyi monthly salary .She is entitled to a house
allowance of Ksh. 8,000 a person relief of Ksh. 1064 month and Monthly insurance relief at the rate
of 15% of the premium paid. Every month she pays the following.
(i) Electricity bill shs.780
(ii) Water bill shs. 560
(iii) Co-operative shares shs. 1200
(iv) Loan repayment Ksh. 5000
(v) Monthly insurance premiums of Ksh 1260
(a) Calculate her P.A.Y.E (2Marks)
(b)Calculate her monthly taxable income . (6Marks)
(c) Calculate her basic salary per month (2Marks)

Mr. Wanyama wishes to take student from wonderful mixed secondary school for a tour. The total
number of pupils to be taken should not exceed 60. Each girl must contribute sh.10,000 and each boy
sh.15,000 and money to be contributed must not exceed sh.120,000. If this trip is to be successful the number of boys must conditionally be greater than girls.
a) Write down five inequalities to represent this information taking the number of boys and girls to be
x and y respectively. (4 marks)
b) Represent the above information on the graph paper below. (4 marks)
c) What is the optimum number of boys and girls to be taken in order to be minimise cost. (2 mark)

In the figure below, line BD is the diameter of the circle, centre O and AE is a tangent.
Angle CBA = 110^o and angle BAC =26^o‍

Find the following angles, giving reasons for each answer.
a) ∠ABD (3marks)
b) ∠DAE (1mk)
c) ∠AED (3marks)
d) ∠AOD (3marks)