NECO Past Questions and Answers - Page 133

661.

Find the absolute mean deviation of the sample 10, 12, 14, 11, 13.

A.

14.6

B.

14

C.

12

D.

6.2

E.

1.2

Correct answer is E

No explanation has been provided for this answer.

662.

Simplify (6 - x - x2) ÷ (x2 - 4)

A.

(3 + x) ÷ (x + 2)

B.

(x - 3) ÷ (x - 2)

C.

(x - 3) ÷ (x + 3)

D.

(3 - x) ÷ (x + 2)

E.

(3 - x) ÷ (x - 2)

Correct answer is A

(6 - x - x2) = ( 2 - x ) ( 3 + x ) divides ( x^2 - 4 ) = ( -2 - x ) ( 2 - x ) = ( 3 + x ) / ( x + 2)

663.

If (x - a) is a factor of bx - ax + x2 - ab, what is the other factor?

A.

(x + b)

B.

(b - a)

C.

(x - a)

D.

(a + b)

E.

(a - b)

Correct answer is A

No explanation has been provided for this answer.

664.

Mohammed is 8 years older than Joy now. In five years’ time he will be twice as old as Joy. How old is Joy now?

A.

1\(\frac{1}{2}\)years

B.

3years

C.

4\(\frac{1}{2}\)years

D.

6 years

E.

ong>

Correct answer is B

No explanation has been provided for this answer.

665.

The diagonals of a rhombus are 6cm and 8cm. Find the area of the rhombus.

A.

96cm2

B.

48cm2

C.

24cm2

D.

0.14cm2

E.

12cm2

Correct answer is C

Area of a rhombus = \(\frac{pq}{2}\)

where p and q are the two diagonals of the rhombus.