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JAMB Mathematics 2013 Paper
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© africaexams.com
Question : 24
Total: 47
The mean of seven numbers is 10. If six of the numbers are 2, 4, 8, 14, 16 and 18, find the mode.
6
8
14
2
Validate
Solution:
Using x =
∑
x
N
in each case, we get;
i
=
1
∑
6
x
i
= 10 x 7 = 70
i
=
1
∑
7
x
i
= 2 + 4 + 8 + 14 + 16 + 18 = 62
Hence the missing number can be obtained from
i
=
1
∑
6
x
i
−
i
=
1
∑
7
x
i
= 70 - 62 = 8
So, all the seven numbers are 2, 4, 8, 8, 14, 16, 18
Mode = 8
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