Tamil Nadu Board Solutions for Chapter: Statistics And Probability, Exercise 5: Thinking Corner

For any collection of $n$ values, can you find the value of $\Sigma \left(x_i-\overline{x}\right)$

For any collection of $n$ values, can you find the value of $\left(\Sigma x_i\right)-\overline{x}$

 The standard deviation of a data is $2.8$, if $5$ is added to all the data values then the new standard deviation is _____.

If $S$ is the standard deviation of values  $p, q, r$  then standard deviation of $p–3, q–3, r–3$  is _____.