Find the average height of the students from the given table.

Find the median of heights of the students from the following frequency distribution.

A curious student of Statistics calculated the average height of all the students of his class as A. He also calculated the average of the average heights of all the possible pairs of students (two students taken at a time) as B. Further, he calculated the average of the average heights of all the possible triplets of students (three students taken at a time) as C. Which of the following is true of the relationship among A, B and C?

The average height of 22 students of a class is 140 cm and the average height of 28 students of another class is 152 cm. What is the average height of students of both the classes?

The average weight of 55 students is 55 kg , and the average weight of another 45 students is 45 kg . Find the average weight of all the students .

If the average weight of the students of a class is 15kg, the average weight of the students of another class is 30kg and average weight of the students of both the classes is 25kg, then find the ratio of the number of students of the first class to the another class.

Find the average of the numbers from the given frequency distribution :

In a class of 88 students, the number of girls is 20% more than the number of boys. The average height of the boys is 164 cm and the average height of the girls is 4 cm less than the average height of all the boys and girls in the class. What is the average height (in cm) of all the students in the class ?

If the average weight of the class of students is 15 and the average weight of another class of students is 30, then the find the ratio of the students of the first class to the another class of 30 students when the average weight of both the classes is 25: