Waec Further Mathematics 2015 Past Questions and Answers

Question 6:

• WAEC 2015

Given that \(y = 4 - 9x\) and \(\Delta x = 0.1\), calculate \(\Delta y\).

A. 9.0
B. 0.9
C. -0.3
D. -0.9

Question 7:

• WAEC 2015

Four fair coins are tossed once. Calculate the probability of having equal heads and tails.

A. \(\frac{1}{4}\)
B. \(\frac{3}{8}\)
C. \(\frac{1}{2}\)
D. \(\frac{15}{16}\)

Question 8:

• WAEC 2015

In calculating the mean of 8 numbers, a boy mistakenly used 17 instead of 25 as one of the numbers. If he obtained 20 as the mean, find the correct mean.

A. 24
B. 23
C. 21
D. 19

Question 9:

• WAEC 2015

Simplify: \(^{n}C_{r} ÷ ^{n}C_{r-1}\)

A. \(\frac{n(n-r)}{r}\)
B. \(\frac{n}{r(n-r)}\)
C. \(\frac{1}{r(n-r)}\)
D. \(\frac{n+1-r}{r}\)

Question 10:

• WAEC 2015

If \(2\sin^{2} \theta = 1 + \cos \theta, \leq \theta \leq find the value of \(\theta\).

A. 90°
B. 60°
C. 45°
D. 30°