A data consists of n observations: x_1, x_2, , x_n. If _ i=1 ^n(x_i + 1)^2 = 9n and _ i=1 ^n(x_i - 1)^2 = 5n,...

Question

A data consists of n observations: x_1, x_2, , x_n. If _ i=1 ^n(x_i + 1)^2 = 9n and _ i=1 ^n(x_i - 1)^2 = 5n, then the standard deviation of this data is:

Accepted Answer

(B)

JEE Main 2019 Mathematics question

Solution