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WAEC Mathematics Past Questions & Answers - Page 276

1,376.

Find the probability that a number selected from the number 30 to 50 inclusive is a prime

A.

1/4

B.

5/21

C.

2/7

D.

3/10

E.

1/3

View answer & explanation

Correct answer is B

30 (31) 32 33 34 35 36 (37) 38 39 40 (41) 42 (43) 44 45 46 (47) 48 49 50
prob = 5/21

1,377.

Two cards are drawn one after the other with replacement from a well-shuffled ordinary deck of 52 cards containing four Aces. Find the probability that they are both Aces

A.

1/221

B.

1/169

C.

1/52

D.

1/26

E.

1/13

View answer & explanation

Correct answer is B

1st card prob = 4/52 2nd card prob = 4/52
prob.both are aces = (4/52) x (4/52) = 1/169

1,378.

The mean heights of the three groups of students consisting of 20, 16 and 14 students are 1.67m, 1.50m and 1.40m respectively. Find the mean height of the students

A.

1.52m

B.

1.53m

C.

1.54m

D.

1.55m

E.

1.56m

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,379.

The percentage of the students with mass less than 69kg is

A.

56%

B.

62.5%

C.

68%

D.

70%

E.

87.5%

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,380.

The median of the distribution is

A.

9.5kg

B.

11kg

C.

67kg

D.

65.5kg

E.

68kg

View answer & explanation

Correct answer is E

67+682=67.5=68kg


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