Question

The mean height of 5 girls is 138 cm . if the individual height of 4 of them are 140cm ,135cm,142 cm,and 138 cm. find the height of fifth girl ?

pls do correct answer ​

Answer 1

Answer:

Let, fifth girl's height be x

Mean = sum of all observation/no. of observations

138cm = 140cm +135cm +142cm+ 138cm+x/

5

138cm×5 = 555cm+x

x = 690cm-555cm

x=135cm