Let X_1, X_2, ........, X_ 18 be eighteen observations such that _ i=1 ^ 18 (X_i- )=36 & _ i=1 ^ 18 (X_i-...

Question

Let X_1, X_2, ........, X_ 18 be eighteen observations such that _ i=1 ^ 18 (X_i- )=36 & _ i=1 ^ 18 (X_i- )=90, where and are distinct real numbers. If the standard deviation of these observations is 1, then the value of | - | is________.

Accepted Answer

4

JEE Main 2021 Mathematics question

Solution