2017/18 PRIVATE WASSCE (GCE) MATHEMATICS QUESTIONS ANSWERS

2017 WAEC GCE MATHEMATICS ANSWERS

1a)

√2=1414

=1+√72/√2

=1+√36*2/√2

=1+6√2/√2

=1+6*1.414/1.414

=6.7072

=6.71

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2a)

x/1+3/2x≥5/3x-7/6

L.C.M=6

6x+9x≥10x-7

15x-10x≥-7

5x/5≥-7/5

x≥-7/5

2b)

From fig QTSR

90 (degree) + 150 (degree) + 30 ( degree) + <QRS = 360

<QRS = 360 - (90+150+30)

<QRS = 360 - 270

<QRS = 90

/OQ/ = /OT/ = radius

<PQT= 90

(angle substended by a diameter)

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5)

Tabulate

X|0|1|2|3|4|5|

F|7|3|5|11|10|14|=59

Fx|0|3|10|33|40|70|=156

(a)mean(x)=Efx/Ef

=156/50=3.12

x=3

(b)Q3-Q1

Q3=3N/4=3*50/4=37.5

Q3=5

Q1=n/4=50/4=12.5

Q1=2

inter-quartile range=5-2=3

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6ai)

m=ns+pr/s+r

m(s+r)=ns+pr

ms+mr=ns+pr

mr-pr=ns-ms

r=ns-ms/m-p

r=s(n-m)/m-p

6aii)

r=2.5(10-15)/15-18

r=2.5(-5)/-3

r=-12.5/-3

r=4.17

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