1993 - WAEC Mathematics Past Questions and Answers - page 5
How many student took the examination
How many students scored less than 7 marks?
What is the probability that an integer selected from the set of integers (20, 21, ...., 30) is a prime number?
S = {20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30}
n(S) = 11
P = {23, 29}
n(P) = 2
Prob(P) = \(\frac{2}{11}\)
A fair die is rolled once. What is the probability of obtaining a number less than 3?
What is the probability of having an even number in a single toss of a fair die?
Prob(even number in single toss) = \(\frac{3}{6}\)
= \(\frac{1}{2}\)
What is the probability that the total sum of seven would appear in toss of a fair die?
No of possible outcome = 36
Required outcome (R) = {(1, 6), (6, 1), (2, 5), (5, 2), (3, 4), (4, 3)}
n(R) = \(\frac{6}{36}\)
= \(\frac{1}{6}\)
A die is rolled 200 times the outcomes obtained are shown in the table below.
Find the probability of obtaining 2.
| Number | 1 | 2 | 3 | 4 | 5 | 6 |
| No of times | 25 | 30 | 45 | 28 | 40 | 32 |
A die rolled 200 times. The outcome obtained are shown in the table above.
What is the probability of obtaining a number less than 3 ?
Prob(less than 3) = \(\frac{25 + 30}{200}\)
= \(\frac{11}{40}\)
= 0.275