The bearing of a point P from another point Q is 310o. If |PQ| = 200m, how far west of Q is P?
128.6m
153.2m
167.8m
187.9m
Correct answer is B
cos 40 = \(\frac{x}{200}\)
x - 200 x cosx
= 200 x 0.7660
x = 153.2m
122o
184o
190o
226o
Correct answer is B
No explanation has been provided for this answer.
Divide the sum of 8, 6, 7, 2, 0, 4, 7, 2, 3, by their mean
9
8
7
6
Correct answer is A
Sum = 8 + 6 + 7 + 2 + 0 + 4 + 7 + 2 + 3 = 39
mean = \(\frac{39}{9}\) = 4.33
then \(\frac{sum}{mean}\) = \(\frac{39}{4.33}\)
= 9
3.5 years
3.0 years
2.5 years
2.0 years
Correct answer is A
Median = (\(\frac{n + 1}{2})^{th}\)
= \(\frac{20 + 1}{2} = \frac{21}{2}\)
= 10.5
= \(\frac{{\text{10th term and 11th term}}}{2}\)
= \(\frac{3 + 4}{2} = \frac{7}{2}\)
= 3.5yrs
4.46 years
3.35 years
3.30years
3.00 years
Correct answer is B
Mean(age) = \(\frac{(1 \times 2) + (2 \times 3) + (3 \times 5) + (4 \times 6) + (5 \times 4)}{2 + 3 + 5 + 6 + 4}\)
= \(\frac{2 + 6 + 15 + 24 + 20}{20}\)
= \(\frac{67}{20}\)
= 3.35yrs