Download App

Statistics and Probability — MATHS STD 10 — Question

Tamilnadu BoardEnglish MediumSTD 10MATHSStatistics and Probability1 Mark
MCQ
Variance of first 20 natural numbers is
  • A
    32.25
  • B
    44.25
  • ✓
    33.25
  • D
    30
✓

Answer

Correct option: C.
33.25
33.25

Explanation;
Hint:
Variance of 20 natural numbers is
$
\begin{aligned}
& =\frac{20^2-1}{12} \\
& =\frac{400-1}{12} \\
& =\frac{399}{12} \\
& =33.25
\end{aligned}
$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Choose the most appropriate answer from the given alternatives and write the option code and the corresponding answer." from Statistics and Probability→Statistics and Probability — all question types→MATHS STD 10 question papers→Tamilnadu Board STD 10 question papers→Tamilnadu Board question paper generator→

Similar questions

The sum of all deviations of the data from its mean is
→
The ratio of the volumes of a cylinder, a cone and a sphere, if each has the same diameter and same height is
→
A solid sphere of radius x cm is melted and cast into a shape of a solid cone of the same radius. The height of the cone is …………
→
If $5 x=\sec \theta$ and $\frac{5}{x}=\tan \theta$, then $x^2-\frac{1}{x^2}$ is equal to ………….
→
$\tan \theta \operatorname{cosec}^2 \theta-\tan \theta$ is equal to …………
→
A purse contains 10 notes of ₹ 2000,15 notes of $\text{₹} 500$, and 25 notes of $\text{₹}$ 200 . One note is drawn at random. What is the probability that the note is either a ₹ 500 note or ₹ 200 note?
→
If the ratio of the height of a tower and the length of its shadow is $\sqrt{3}: 1$, then the angle of elevation of the sun has measure
→
The electric pole subtends an angle of $30^{\circ}$ at a point on the same level as its foot. At a second point ' $b$ ' metres above the first, the depression of the foot of the pole is $60^{\circ}$. The height of the pole (in metres) is equal to ..............
→
(1 + tan θ + sec θ) (1 + cot θ – cosec θ) is equal to …………..
→
If $(\sin \alpha+\operatorname{cosec} \alpha)^2+(\cos \alpha+\sec \alpha)^2=k+\tan ^2 \alpha+\cot ^2 \alpha$, then the value of $k$ is equal to ……………….
→