engineering recuitment NIC NIELIT Scientist B 2023 Mock Test Engineering Mathematics Probability and Statistics Statistical Variables
If the mean and the standard deviation of n observations x1, x2, _ _ _ _ _, xn be x̅ and σ respectively, then the mean and standard deviation of -x1, -x2, -x3, _ _ _ _ _, -xn are, respectively,:
1
x̅, -σ
2
-x̅, σ
3
x̅, σ
4
-x̅, -σ