Mean $= 3$. Variance $= \frac{4+1+0+1+4}{5} = 2$
$$\sigma = \sqrt{2}$$
Back to JEE Main 2023 Probability & Statistics
JEE Main 2023 — Mathematics Probability & Statistics
medium
mcq
2023
Official previous-year question
Verified 30 May 2026.
Question
The standard deviation of the observations $1, 2, 3, 4, 5$ is:
Options
- A
$\sqrt{2}$
- B
$\sqrt{3}$
- C
$\sqrt{5}$
- D
$2$
Solution
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