Question

5 students of a class have an average height 150 cm and variance 18 cm2. A new student, whose height is 156 cm, joined them. The variance (in cm2) of the height of these six students is

(1) 16

(2) 22

(3) 18

(4) 20

Answer 1

Correct option (4) 20

Explanation:

Let '5' students are x1, x2, x3, x4, x5