AP EAMCET · Maths · Statistics
The mean and variance of observations are and respectively. If , then the value of is equal to
- A
- B
- C
- D
Answer & Solution
Correct Answer
(D)
Step-by-step Solution
Detailed explanation
The variance of n observation is σ2=1n∑i=1nxi2-x¯2, where x¯ is the mean of the observations. Hence, putting the given values, we get 0=1n400-52 ⇒400n=25 ⇒n=16.
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