JEE Main & Advanced
Mathematics
Statistics
Question Bank
Numerical Value Type Questions - Statistics
question_answer
A data consists of n observations: \[{{x}_{1}},{{x}_{2}},.....,{{x}_{n}}.\] If \[\sum\limits_{i=1}^{n}{{{({{x}_{i}}+1)}^{2}}=9n}\] and \[\sum\limits_{i=1}^{n}{{{({{x}_{i}}-1)}^{2}}=5n}\] and the standard deviation of this data is \[\sqrt{a},\] then a is