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JAMB Mathematics Past Questions & Answers - Page 89

441.

Given U = {x: x is a positive integer less than 15} and P = {x: x is even number from 1 to 14}. Find the compliment of P.

{1, 3, 5, 7, 9, 11, 13, 15}

{2, 3, 5, 7, 9, 11, 13}

{1, 3, 5, 7, 9, 11, 13}

{2, 3, 5, 7, 11, 15}

View answer & explanation

Correct answer is C

U = {1, 2, 3, 4, 5......14}
P = {2, 4, 6, 8, 10, 12, 14}
P' = {1, 3, 5, 7, 9, 11,13}

442.

$\begin{array}{c|c} Marks & 2 & 3 & 4 \\ \hline Frequency & 4 & 4 & y \end{array}$

The table above shows the frequency distribution of marks obtained by a group of students. If the total mark is 48, find the value of y.

View answer & explanation

Correct answer is C

(2 x 4) + (3 x 4) + (4 x y) = 48
8 + 12 + 4y = 48
4y = 48 - 20
$\frac{4y}{4}$ = $\frac{28}{4}$
y = 7

443.

Calculate the perimeter of a sector of a circle of raduis 12cm and angle 60o.

(12 + 4 $\pi$ )cm

(24 + 4 $\pi$ )cm

(12 + 6 $\pi$ )cm

(24 + 6 $\pi$ )cm

View answer & explanation

Correct answer is B

Perimeter = 2r + $\frac{\theta}{360}$ x 2 $\pi$ r
= 2(12) + $\frac{60}{360}$ x 2 x $\pi$ x 12
= (24 + 4 $\pi$ )cm

444.

Factorize k² - 2kp + p².

(k +p)²

(k - p)²

k² + p²

k² - p²

View answer & explanation

Correct answer is B

k² - 2kp + p² = (k - p)²

445.

The bar chart above shows the number of visitors received in a week. How many visitors were received on Friday, Tuesday and Sunday?

View answer & explanation

Correct answer is D

No of visitors = 10 + 5 + 1 = 16

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