Question
Download Solution PDFIf the sum of 10 observations is 12 and the sum of their squares is 18, then the standard deviation is:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is 3/5
Key Points
Standard deviation =
Therefore, Variance V(X) =
or,
Given, the sum of 10 observations is 12 and the sum of their squares is 18.
Thus, n = 10,
Therefore, mean
Plugging this information into the equation of variance V(X), we have
= 1.8 - 1.44
=0.36
Hence, the required standard deviation =
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