There are 50 students in a class of which 40 are boys and the rest girls. The average weight of the students in the class is 44 kg and average weight of the girls is 40 kg. Find the average weight of boys.
Solution:
Total students of a class = 50
No. of boys = 40
No. of girls = 50 – 40 = 10
Average weight of 50 students = 44 kg
Total weight = 44 × 50 = 2200 kg
Average weight of 10 girls = 40 kg
.’. Total weight of girls = 40 × 10 = 400 kg
Then the total weight of 40 boys = 2200 – 400 = 1800kg
Average weight of boys = 
The contents of 50 boxes of matches were counted giving the following results
Calculate the mean number of matches per box.
Solution:
More Solutions:
- The heights of 50 children were measured
- Find the value of p if the mean of the following distribution is 18.
- Calculate the Arithmetic mean, correct to one decimal place.
- Calculate f1, and f2, if the mean daily expenditure is Rs 188.
- The measures of the diameter of the heads of 150 screw.
- The median, arranged in ascending order is 25.