The following table shows the information about marks obtained in Physics,Chemistry,Mathematics,and Biology by $100$ students in a class. Which subject shows the highest variability in marks?
PhysicsChemistryMathematicsBiology
Mean$20$$25$$23$$27$
$S$.$D$.$3$$2$$4$$5$

  • A
    Mathematics
  • B
    Chemistry
  • C
    Biology
  • D
    Physics

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From the prices of shares $X$ and $Y$ below,find out which is more stable in value:
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The standard deviation of $7$ observations $1, 2, 3, 4, 5, 6, 7$ is:

For the following frequency distribution,find the variance:
$X$$5$$6$$7$$8$$10$
Frequency$3$$7$$4$$2$$4$

If the variance of $10$ natural numbers $1, 1, 1, \dots, 1, k$ is less than $10$,then the maximum possible value of $k$ is ...... .

Consider three observations $a, b,$ and $c$ such that $b = a + c$. If the standard deviation of $a + 2, b + 2, c + 2$ is $d$,then which of the following holds true?

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