Q1. In a family of seven persons there are three earning members having monthly income of Rs. 1800, Rs. 1400 and Rs. 1000. What is the average income of a member in a family?

Q2. The mean weight of 34 students of class 9th of a school is 42kg. If the weight of the teacher be included, the mean rises by 400gm. Find the weight of teacher.

Q3. the mean of six no. is 20. If one no. is excluded, the mean is 15. Find the value of the excluded no.

Ans 1. Average income of each family member =

 

Ans 2. Let the weight of the teacher be x

Weight of 34 students of the class = 34×42 = 1428kg

According to the question

Solving this we get x = 56kg

 

Ans 3.

sum of 6 numbers = 120

Let the excluded no be x

According to question

Solving this we get x = 45

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A1. Rs 600.

Add the 3 incomes and divide by 7.

A2. 56kg

A3. 45

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