Mean and standard deviation of two distributions of 100 and 150 items are 50, 5 and 40, 6 respectively. Find the standard deviation of all the 250 items taken together.

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The standard deviation of 5 items is found to be 15. What will be the standard deviation if the values of all the items are increased?

The correct option is A 15Standard deviation is the square root of the arithmetic mean of the squares of the deviations measured from the arithmetic mean of the data. Standard deviation is not affected by the increase of decrease of observations in the series.

The standard deviation of $5$ items is found to be $15$ . What will be the standard deviation if the values of all the items are increased?

The correct option is A $15$
Standard deviation is the square root of the arithmetic mean of the squares of the deviations measured from the arithmetic mean of the data. Standard deviation is not affected by the increase of decrease of observations in the series.