Question

The mean weight per student in a group of 7 students is 55 kg. The individual weights of 6 of them (in kg) are 52, 54, 55, 53, 56 and 54. Find the weight of the seventh student.

Answer 1

Answer:

Mean=Sum of all observations/Total no.of observations

Mean=Sum of all weights/Total no.of weights

Weight of seventh student=x

Mean=52+54+55+53+56+54+x/7

55=324+x/7

55×7=324+x

385=324+x

385-324=x

x=61

Hence,weight of the seventh student=61 kg