WAEC Past Questions and Answers - Page 3992

19,956.

The table gives the distribution of outcomes obtained when a die was rolled 100 times.

What is the experimental probability that it shows at most 4 when rolled again?

A.

8/25

B.

12/25

C.

13/25

D.

2/3

E.

17/25

View answer & explanation

Correct answer is E

18 + 14 + 20 + 16/100

=

17/25

19,957.

A bag contains 3 red, 4 black and 5 green identical balls. Two balls are picked at random, one after the other without replacement. Find the probability that one is red and the other is green

A.

2/3

B.

5/11

C.

5/22

D.

5/24

E.

5/48

View answer & explanation

Correct answer is C

Total balls = 12
RG or GR

3/12

x

5/11

+

5/12

x

3/11

 

5/44

+

5/44

=

10/44

=

5/22

19,958.

What percentage of observation lie outside interquartile range of any distribution?

A.

121/2%

B.

25%

C.

50%

D.

621/2 %

E.

75%

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

19,959.

The marks obtained by pupils of class are grouped as shown below; 0 - 4, 5 - 9,10 -14, 15 -19. Which of the following is/are not true?

l. The mid values of the grouped marks are 2, 7, 12 and 17.

II The class interval is 4.

III The class boundaries are 0.5, 4.5, 9.5, 14.5 and 19.5

A.

I only

B.

II only

C.

III only

D.

I and II only

E.

II and III only

View answer & explanation

Correct answer is B

0 - 4; Mid Values 0 + 4/2 = 2
5 - 9; 5 + 9/2 = 7
10 - 14; 10 + 14/2 = 12
15 - 19; 15 + 19/2 = 17
The class interval is 5 class boundaries are 0.5, 4.5, 9.5, 14.5, 19.5

19,960.

The cumulative frequency curve may be used to find the

A.

Variance

B.

Standard deviation

C.

Mode

D.

Median

E.

Mean

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.


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