Question

90 observations The standard deviation of a set of is 105. If the value of each observation is decreased by a, then the new standand deviation of these obsenvation would be​

Answer 1

Answer:

Explanation:

105 itself

because adding or decreasing a constant value from each observations does not change SD

only multiplication and division by a constant changes SD .

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Answer 2

Answer:

New standard deviation will be 105

Explanation:

Given data

The standard deviation of a set of 90 observations = 105

each observation is decreased by a

here we need to find what will be the new standard deviation

Note: adding any number to each observation or subtracting of any number from each observation in a data, doesn't change the value of Standard deviation  

from given data each observation is decreased by a

⇒ new standard deviation will be same as old standard deviation which is 105