6
5
8
7
10
Correct answer is B
Add all the No.s together to give 100
∑xf = 100
N = 20
x = ∑xfN
= 10020
= 5
What is the area between two concentric circles of diameters 26cm and 20cm?
100π
169π
69π
9π
269π
Correct answer is C
Area of circle 1 with diameter 26cm:
πr2=π×(262)2
= 169πcm2
Area of circle 2 with diameter 20 cm:
πR2=π×(202)2
= 100πcm2
Area between the two circles = (169−100)πcm2
= 69πcm2
Evaluate correct to 4 decimal places 827.51 x 0.015
8.8415
12.4127
124.1265
12.4120
114.1265
Correct answer is B
827.51 x 0.015 By normal multiplication or use of four figure table, 827.51 x 0.015 = 12.4127 (to 4 decimal places).
A cuboid has a diagonal of length 9cm and a square base of side 4cm. What is its height?
9cm
√65cm
4√2cm
7cm
6.5cm
Correct answer is B
Given a cuboid, the diagonal cuts a face of the cuboid into 2 right-angled triangles.
Hence, using the Pythagoras theorem, we have
92=42+x2
81=16+x2
x2=81−16=65
∴
Which of the following fractions is less than one-third?
\frac{22}{63}
\frac{4}{11}
\frac{15}{46}
\frac{33}{98}
\frac{122}{303}
Correct answer is C
All others are greater than 0.333 when converted to their fractions except \frac{15}{46}