Waec Mathematics Past Questions and Answers

Question 281:

• WAEC 1992

A fair die is rolled once. What is the probability of
obtaining 4 or 6?

A. 1/12
B. 1/6
C. 1/3
D. 1/2
E. 2/3

Question 282:

• WAEC 1992

Three balls are drawn one after the other with replacement, from a bag containing 5 red, 9white and 4 blue identical balls, What is the probability that they are one red, one white and one blue?

A. 5/102
B. 5/136
C. 5/162
D. 5/204
E. 5/243

Question 283:

• WAEC 1992

The data below shows the number of worker?
employed in the various sections of a construction
company in Lagos.
Carpenters 24 Labourers 27
Plumbers 12 Plasterers 15
Painters 9 Messengers 3
Bricklayers 18

If one of the workers is absent on a certain day,
what is the probability that he is a bricklayer?

A. 1/12
B. 1/9
C. 2/9
D. 1/6
E. 1/4

Question 284:

• WAEC 1992

The data below shows the number of worker?
employed in the various sections of a construction
company in Lagos.
Carpenters 24 Labourers 27
Plumbers 12 Plasterers 15
Painters 9 Messengers 3
Bricklayers 18

If a worker is retrenched, what is the probability that he is a plumber or plasterer.

A. 1/27
B. 1/9
C. 5/36
D. 1/4
E. 3/4

Question 285:

• WAEC 1992

(a) If \(9^{2x - 1} = \frac{81^{x - 2}}{3^{x}}\), find x.
(b) Without using Mathematical Tables, evaluate: \(\sqrt{\frac{0.81 \times 10^{-5}}{2.25 \times 10^{7}}}\)