Question

The mean mass of four women is 60 kg.

Another women has a mass of 70 kg
Work out the mean mass of five women

Answer 1

`Mean\;Mass\;of\;Four\;Women = (Sum\;of\;Masses\;of\;Four\;Women)/(4)`

Given Mean Mass of Four Women = 60

`\implies (Sum\;of\;Masses\;of\;Four\;Women)/(4) = 60\\ \\\implies Sum\;of\;Masses\;of\;Four\;Women = 60*4 = 240`

Given the Mass of Fifth Woman = 70 kg

`Mean\;Mass\;of\;Five\;Women = ((Sum\;of\;Masses\;of\;Four\;Women) + (Mass\;of\;Fifth\;Woman))/(5)`

`\implies Mean\;Mass\;of\;Five\;Women = (240 + 70)/(5) = (310)/(5) = 62\;Kg`

Answer 2

Okay so, 60 x 4 = 240

240 + 70 = 310

310 / 5 = Mean of 62