List of top Mathematics Questions on Statistics asked in IPU CET

The standard deviation of a data is 6, when each observation is increased by 1, then the standard deviation of the new data is

If the arithmetic mean of the following data is 7, then \( a + b = \) \[ \begin{array}{|c|c|c|c|c|} \hline x_i & 4 & 6 & 7 & 9 \\ f_i & a & 4 & b & 5 \\ \hline \end{array} \]

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If the SD of a set of observations is 8 and each observation is divided by -2, then the SD of the new set of observation will be: