JAMB Mathematics Past Questions & Answers - Page 212

1,056.

A man kept 6 black, 5 brown and 7 purple shirts in a drawer. What is the probability of his picking a purple shirt with his eyes closed?

A.

\(\frac{1}{7}\)

B.

\(\frac{11}{18}\)

C.

\(\frac{7}{18}\)

D.

\(\frac{7}{11}\)

Correct answer is C

Prob. of purple shirt is \(\frac{7}{18}\)

1,057.

Find the probability that a number selected at random from 40 to 50 is a prime

A.

\(\frac{5}{11}\)

B.

\(\frac{5}{11}\)

C.

\(\frac{3}{11}\)

D.

\(\frac{4}{11}\)

Correct answer is C

From 40 to 50 = these number are prime i.e. 41, 43, 47

prob. of selecting a prime No. is \(\frac{3}{11}\)

1,058.

Find the median of the numbers 89, 141, 130, 161, 120, 131, 131, 100, 108 and 119

A.

131

B.

125

C.

123

D.

120

Correct answer is B

Explanation
Arrange in ascending order

89, 100, 108, 119, |120, 130|, 131, 131, 141, 161

Median = \(\frac{120 + 130}{2}\)

= 125

1,060.

An open rectangular box externally measures 4m x 3m x 4m. Find the total cost of painting the box externally if it costs N2.00 to paint one square meter

A.

N96.00

B.

N112.00

C.

N136.00

D.

N160.00

Correct answer is B

Total surface area(s) = 2(4 x 3) + 2(4 x 4)

= 2(12) + 2(16)

= 24 + 32

= 56cm2

1m2 costs N2.00

∴ 56m∴ will cost 56 x N2.00

= N112.00