How good are you with figures and formulas? Find out with these Mathematics past questions and answers. This Test is useful for both job aptitude test candidates and students preparing for JAMB, WAEC, NECO or Post UTME.
Calculate the mean deviation of the set of numbers 7, 3, 14, 9, 7, and 8.
13/6
5/2
7/6
7/3
Correct answer is D
| x | 7 | 3 | 14 | 9 | 7 | 8 | Total |
| \(x - \bar{x}\) | -1 | -5 | 6 | 1 | -1 | 0 | |
| \(|x - \bar{x}|\) | 1 | 5 | 6 | 1 | 1 | 0 | 14 |
Mean : \(\frac{7 + 3 + 14 + 9 + 7 + 8}{6} = \frac{48}{6} = 8\)
Mean deviation : \(\frac{\sum |x - \bar{x}|}{n} = \frac{14}{6} = \frac{7}{3}\)
105
100
95
110
Correct answer is D
Let the sum of the first five numbers and the sixth number be x and t respectively.
\(\frac{x + t}{6} = 60 \implies x + t = 360\)
\(\frac{x}{5} = 50 \implies x = 250\)
\(\therefore t = 360 - 250 = 110\)
How many three-digit numbers can be formed from 32564 without repeating any of the digits?
120
10
20
60
Correct answer is D
To get the answer, we simply do
\(\frac{5!}{(5 - 3)!}\)
= \(\frac{5 \times 4 \times 3 \times 2 \times 1}{2 \times 1}\)
= 60
108°
180°
36°
60°
Correct answer is C
Total: 2 + 5 + 3 + 11 + 9 = 30
Cassava: \(\frac{3}{30} \times 360° = 36°\)
2/3
4/9
8/27
1/27
Correct answer is D
P(not passing exam) = \(1 - \frac{2}{3} = \frac{1}{3}\)
P(not passing any of the three exams) = \(\frac{1}{3} \times \frac{1}{3} \times \frac{1}{3}\)
= \(\frac{1}{27}\)