Question

Mean weight of 29 students 50 kg .if weight of teachers is included the mean weight is 51kg. Find the weight of the teacher

Answer 1

The weight of the teacher is 80 kg

Step-by-step explanation:

Given data

Total number of students (N) = 29

Mean weight of students = 50 kg

Total weight of students =Mean weight of students×Total number of students

So

Total weight of students =50× 29 = 1450 kg

If teacher weight is included

Total number of students and teacher (N+1) = 30

Mean weight of students and teacher = 51 kg

Total weight of students and teacher = 51×30 = 1530 kg

Now

Weight of teacher = Total weight of students and teacher -Total weight of students

Weight of teacher = 1530-1450 = 80 kg

Answer 2

Answer:

80kg

Step-by-step explanation:

Mean of weight of 29 students is 50

So,sum of weight of 29 students is 50×29=1450kg

Also, mean weight of 30 (including the teacher) is 51 kg

So, sum of weight of 30 people=51×30=1530

To find the weight of teacher subtract the sum of 30-sum of 29

1530-1450=80kg