If the mean and variance of


If the mean and variance of six observations $7,10,11,15, \mathrm{a}, \mathrm{b}$ are 10 and $\frac{20}{3}$, respectively, then the value of $|a-b|$ is equal to :

  1. 9

  2. 11

  3. 7

  4. 1

Correct Option: , 4



$\Rightarrow a+b=17$..(1)



Solve (i) and (ii) $a=9, b=8$ or $a=8, b=9$


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