9. The mean weight of 10 students in a class is 50 kg. When the weight of the teacher is
added, the mean weight goes up by 1 kg. Find the weight of the teacher
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Let the weight of teacher be = x
Mean = weight of students
total students
50 = weight of students
10
weight of students = 50 × 10 = 500kg
When teacher's weight is added
50 + 1 = weight of students + weight of teacher
10 + 1
51 = 500 + x
11
500 + x = 51 × 11
500 + x = 561
x = 561 - 500
x = 61 kg
Weight of teacher = 61 kg
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