Question

Cream, ch
ice-cream,
2. The mean marks of seven students are 55. The
marks of 6 students are 52, 54, 55, 53, 56 and
54. Find the marks of the seventh student.

cold drink​

Answer 1

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

∴ The weight of the seventh student

=Total wieghts of 7 students− total weights of 6 students

=385−324

=61