Waec Mathematics 1988 Past Questions and Answers

Question 41:

• WAEC 1988

The surnames of 40 children in a class arranged in alphabetical order. 16 of the surnames begins with O and 9 of the surname begins with A, 14, of the letters of the alphabet do not appear as the first letter of a surname

What is the probability that the surname of a child picked at random from the class begins with either O or A?

A. 5/8
B. 7/8
C. 9/16
D. 14/25
E. 39/40

Question 42:

• WAEC 1988

The surnames of 40 children in a class arranged in alphabetical order. 16 of the surnames begins with O and 9 of the surname begins with A, 14, of the letters of the alphabet do not appear as the first letter of a surname

If more than one surname begins with a letter besides A and O, how may surnames begin with that letter

A. 2
B. 3
C. 4
D. 5
E. 6

Question 43:

• WAEC 1988

The number of items produced by a company over a five- year period is given below:

Year	1978	1979	1980	1981	1982
No produced	4100	2500	1500	1800	9200

(i) Plot a bar chart for this information; (ii) What is the average production for the five- year period.

Question 44:

• WAEC 1988

In the diagram, < PQR = < PSQ = 90°, |PS| = 9 cm, |SR| = 16 cm and |SQ| = x cm.
(a) Find the value of x using a trigonometric ratio.
(b) Calculate : (i) the size of < QRS to the nearest degree; (ii) |PQ|.

Question 45:

• WAEC 1988

(a) Given that \(\sin \alpha = 0.3907\), use tables to find the value of : (i) \(\tan \alpha\) ; (ii) \(\cos \alpha\).
(b) A ladder of length 4.5m leans against a vertical wall making an angle of 50° with the horizontal ground. If the bottom of a window is 4m above the ground, what is the distance between the top of the ladder and the bottom of the window? (Answer correct to the nearest cm)