Question

The mean height of 6 girls is 148cm.If the individual height of five of them are 142,154,146,145,150.find the height of sixth girl

Answer 1

sum of observations
---------------------------------
number of observations
= mean
so,
142+154+146+145+150+x
------------------------------------ =148
6

737+x
---------- = 148
6

737+x =148×6
737+x =888
x = 888-737
x = 151

therefore, the height of the sixth girl is 151 cm

hope I am clear and correct