Mathematics 1995 Waec Past Questions and Answers

Question 46 :

• WAEC 1995

The mean of 20 observations in an experiment is 4, lf the observed largest value is 23, find the mean of the remaining observations.

A. 4
B. 3
C. 2.85
D. 2.60
E. 2.56

Question 47 :

• WAEC 1995

Find the median of the following numbers 2.64, 2.50, 2.72, 2.91 and 2.35.

A. 2.91
B. 2.72
C. 2.64
D. 2.50
E. 2.35

Question 48 :

• WAEC 1995

Two fair dice are tossed together once. Find the probability that the sum of the outcome is at least 10.

A. 1/12
B. 5/ 36
C. 1/ 6
D. 1/4
E. 5/18

Question 49 :

• WAEC 1995

From a box containing 2 red, 6 white and 5 black balls, a ball is randomly selected. What is the probability that the selected ball is black?

A. 2/13
B. 5/13
C. 5/11
D. 5/6
E. 11/13

Question 50 :

• WAEC 1995

(a) Factorise : \(px - 2px - 4qy + 2py\)
(b) Given that the universal set U = {1, 2, 3, 4,5, 6, 7, 8, 9, 10}, P = {1, 2, 4, 6, 10} and Q = {2, 3, 6, 9}; show that \((P \cup Q)' = P' \cap Q'\)