The average weight of a group of sever boys is 56 kg, 57kg, 55kg, Gokg 59 kg and 55 kg. Find the weight of the seventh boy.
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Answer:
The corrects answer is 63kg
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Answer:
Step-by-step explanation:
Given
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.
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