Question

The height of 8 students X in centimetres are given below:
148, 162, 160, 154, 170, 162, x, 152
If the mean height is 158, find x.

Answer 1

Mean = `(sumx)/"N"`

= `(148 + 162 + 160 + 154 + 170 + 162 + x + 152)/(8)`

= `(1108 + x)/(8)`

∴ 158 = `(1108  + x)/(8)`

⇒ 1264 = 1108 + x
⇒ x = 156
∴ Mean height = 156cm.