class 7 exercise 3.1
Attachments:
Answers
Answered by
0
Answer:
61 kg
Step-by-step explanation:
mean weight per student in a group of 7 students if 55kg
Mean weight of 7 students=55kg
No. of students=7
∴ Mean=
No. of observations
sum of observations
=
7
sum of weights of 7 students
55×7= sum of weights of 7 students
Sum of weights of 7 students=385kg
and given individual weights of 6 of them(in kg) are
52,54,53,55,56 & 54
Total weights of 6 students
=52+54+55+53+56+54
=324 kg
∴ The weight of the seventh student
=Total wieghts of 7 students− total weights of 6 students
=385−324
=61 kg.
Similar questions