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JAMB Mathematics Past Questions & Answers - Page 207

1,031.

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?

$\frac{1}{7}$

$\frac{11}{18}$

$\frac{7}{18}$

$\frac{7}{11}$

View answer & explanation

Correct answer is C

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

1,032.

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

$\frac{5}{11}$

$\frac{3}{11}$

$\frac{4}{11}$

View answer & explanation

Correct answer is C

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

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

1,033.

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

131

125

123

120

View answer & explanation

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

1,034.

Of the nine hundred students admitted in a university in 1979, the following was the distribution by state: Anambrs 185, Imo 135, Kaduna 90, Kwara 110, Ondo 155, Oyo 225. In a pie chart drawn to represent this distribution, The angle subtended at the centre by anambra is

50^o

65^o

74^o

88^o

View answer & explanation

Correct answer is C

Anambra = $\frac{185}{900}$ x $\frac{360}{1}$

= 74^o

1,035.

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

N96.00

N112.00

N136.00

N160.00

View answer & explanation

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

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