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WAEC Past Questions and Answers - Page 3898

19,486.

Given that P = {b, d, e, f} and Q = {a, c, f, g} are subsets of the universal set U = {a,b, c, d, e, f, g}. Find P' ∩ Q

A.

{a,c}

B.

{a, c, d, g}

C.

{c, d, g}

D.

{a, c, g}

Correct answer is D

U = {a, b, c, d, e, f, g} P = {b, d, e, f} Q = {a, c, f, g} P' = {a, c, g} P' ∩ Q = {a, c, g}

19,487.

The variance of a given distribution is 25. What is the standard deviation?

A.

125

B.

75

C.

25

D.

5

Correct answer is D

S.D = Variance

= 25

= 5

19,488.

Simplify 514÷(12312)

A.

134

B.

312

C.

412

D.

812

Correct answer is C

514÷(12312)214÷(1436)214÷(116)214×67=412

19,489.

In the diagram above, ∠PQU=36°, ∠QRT = 29°, PQ||RT. Find ∠PQR

A.

94o

B.

65o

C.

61o

D.

54o

Correct answer is B

< UQR = 29° (alternate angles)

< PQR = < PQU + < UQR

= 36° + 29°

= 65°

19,490.

PQRS is a trapezium in which |PS| = 9cm, |QR| = 15cm, |PQ| = 23,PQR=90oandQRS=30o. Calculate the area of the trapezium

A.

243cm2

B.

363cm2

C.

423cm2

D.

723cm2

Correct answer is A

No explanation has been provided for this answer.