2013 - JAMB Mathematics Past Questions and Answers - page 3
21
If y = x sin x, find \(\frac{\delta y}{\delta x}\)
A
sin x - cos x
B
cos x - x sin x
C
cos x + x sin x
D
sin x + x cos x
22
If y = (2x + 2)3, find \(\frac{\delta x}{\delta y}\)
A
3(2x +2)2
B
6(2x +2)
C
3(2x +2)
D
6(2x +2)2
23
The radius of a circle is increasing at the rate of 0.02cms-1. Find the rate at which the area is increasing when the radius of the circle is 7cm.
A
0.75cm2S-1
B
0.53cm2S-1
C
0.35cm2S-1
D
0.88cm2S-1
24
Find the mean of t + 2, 2t - 4, 3t + 2 and 2t.
A
t + 1
B
2t
C
2t + 1
D
t
25
The mean of seven numbers is 10. If six of the numbers are 2, 4, 8, 14, 16 and 18, find the mode.
A
6
B
8
C
14
D
2
26
\(\begin{array}{c|c}Age & 20 & 25 & 30 & 35 & 40 & 45 \\
\hline \text{No. of people} & 3 & 5 & 1 & 1 & 2 & 3 \end{array}\)
Calculate the median age of the frequency distribution in the table above
Calculate the median age of the frequency distribution in the table above
A
25
B
30
C
35
D
20
27
If the variance of 3+x, 6, 4, x and 7-x is 4 and the mean is 5, find the standard deviation
A
\(\sqrt{3}\)
B
2
C
3
D
\(\sqrt{2}\)
28
\(\begin{array}{c|c} Score & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 \ \hline Frequency & 1 & 0 & 7 & 5 & 2 & 3 & 1 & 1 \end{array}\)
The table above shows the scores of 20 students in further mathematics test. What is the range of the distribution?
The table above shows the scores of 20 students in further mathematics test. What is the range of the distribution?
A
7
B
6
C
3
D
10
29
In how many ways can a student select 2 subjects from 5 subjects?
A
\(\frac{5!}{3!}\)
B
\(\frac{5!}{2!2!}\)
C
\(\frac{5!}{2!3!}\)
D
\(\frac{5!}{2!}\)
30
In how many ways can 3 seats be occupied if 5 people are willing to sit?
A
60
B
20
C
5
D
120
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