Find the average of the cubes of the first 7 natural numbers.
According to this formula Average of cubes = n(n+1) ² /4 =7(7+1) ² /4 =7 ×64/4 =112
A student's marks were wrongly entered as 65 instead of 45. Due to this, the average marks for the class increased by 1 /3 The number of students in the...
The ratio of number of girls to number of boys is 3: 2 in a class of 70 students. The average marks scored by the boys in Physics is 72 and the average...
The average age of three children is 20 years. If their ages are in the ratio 2:3:5. Find the age of the youngest child.
The average score obtained by 10 students in a class test is 68 marks. The top place was shared by 3 people who got the same score. If the lowest score ...
The average age of a category of 5 members is 40 years. If a person whose age is 60 years will left the group and two new persons whose age is 'a' years...
There are three numbers. If the average of any two of them is added to the third number, the sums obtained are 177, 163 and 138. Whatis the average of ...
The average weight of A, B, C is 76 kg when D joins them the average weight becomes 70 kg. If E whose weight is 2 kg more than D replaces A, then the av...
The average weight of 4 persons is 30 kg. The heaviest person’s weight is 24 kg more than the lightest person’s weight. If the average weight of the...
Average age of company A is 21 years and average age of both companies A and B is 13 years. If the ratio of number of employees in company A and B is 3:...
If the average marks of the three batches 32, 45 and 54 student respectively is 50, 42 and 35, then find the approximate average mark of all the students?
