The variance of a given distribution is 25. What is the standard deviation?
125
75
25
5
Correct answer is D
S.D = \(\sqrt{Variance}\)
= \(\sqrt{25}\)
= 5
Simplify \(5\frac{1}{4}\div \left(1\frac{2}{3}- \frac{1}{2}\right)\)
\(1\frac{3}{4}\)
\(3\frac{1}{2}\)
\(4\frac{1}{2}\)
\(8\frac{1}{2}\)
Correct answer is C
\(5\frac{1}{4}\div \left(1\frac{2}{3}- \frac{1}{2}\right)\\
\frac{21}{4}\div \left(1\frac{4-3}{6}\right)\\
\frac{21}{4}\div \left(1\frac{1}{6}\right)\\
\frac{21}{4} \times \frac{6}{7}= 4\frac{1}{2}\)
In the diagram above, ∠PQU=36°, ∠QRT = 29°, PQ||RT. Find ∠PQR
94o
65o
61o
54o
Correct answer is B
< UQR = 29° (alternate angles)
< PQR = < PQU + < UQR
= 36° + 29°
= 65°
\(24\sqrt{3} cm^2\)
\(36\sqrt{3} cm^2\)
\(42\sqrt{3} cm^2\)
\(72\sqrt{3} cm^2\)
Correct answer is A
No explanation has been provided for this answer.
A solid cylinder of radius 7cm is 10 cm long. Find its total surface area.
\(70\pi cm^2\)
\(189\pi cm^2\)
\(210\pi cm^2\)
\(238\pi cm^2\)
Correct answer is D
S = \(2\pi r^2 + 2\pi rh\)
= \(2\pi r(r + h)\)
= \(2\pi (7) (7 + 10)\)
= \(238\pi cm^2\)
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