Average

The average age of 20 students in a class is 14 years. A student of age 16 leaves them and a new student joins them. Now their average age becomes 13.8 years. What is the age of the new boy?

average

There are 10 numbers, u₁, u₂, u₃........u₁₀, having a mean/ average of u_m. If the absolute value of the difference of the number and the mean are 5, 3, 10, 15, 12, 8, 6, 9, 2 and 4 respectively then which of the numbers lie on one side of the mean.

Average

There are three numbers, the average of first two numbers is 2 and the average of the last two numbers is 3, and the average of the first and the last numbers is 4. What is the average of three numbers?

average

        If the average of m numbers is a, and on adding x to the m numbers, the average of the (1+m) numbers is b. Then find the value of x.?

Average

1.     The average age of a group of people is increased by 10 when a person aged 19 years is replaced by a new person aged 59 years. How many people are there in the group?

Mean

The average of 13 observations is 23. The average of the first 7 observation is 27 and the average of the last 7 observation is 24. What is the value of the seventh observation?

mean

The average age of 17 players is 14 years. If the age of the coach is included, the average of the group becomes 15 years. What is the age of the coach?

mean

The average of three numbers is 135. The largest number is 180 and the difference between the other two numbers is 45. What is the smallest number?

Mean

5 years ago the average age of a family of 3 members was 17 years. A baby girl was born during the same period such that the average age of the family remains unchanged? What is the age of the baby now?

mean

The average marks of 30 students in the class are increased by 1.2 when a student of mark 42 is replaced by another student. What was the mark obtained by this new student?

mean

The average marks obtained by 30 girls are 55 and the average marks obtained by 20 boys are 40. What is the average marks obtained by  the students in the class?

mean

The average salary per day per head of all the employees in Enerjet is Rs. 1600. The average salary per day per head of 12 officers is Rs. 2400. The average salary per day per head of the rest is Rs. 800. Find the total number of workers.

mean

A person drove his car for first 30 km and then 40 km at an average speed of 50 km and 60 km per hour respectively. At what speed must he drive next 50 km if the average speed of the whole journey is 52km per hour

Mean

The average age of a class of 17 boys at the end of a term was 14 years. Of these 5 left of the average age of 15 years, 4 months later 6new boys of average age 13 years came into the class. What was the average age of the class?

mean

In a class there are three divisions. The number of students and the average marks in mathematics in the three divisions are 30, 40 and 30 and 40%, 30%, 50% respectively. What is the average mark in mathematics of the class? 

Mean

The mean of 6 numbers (out of which 2 numbers are equal) is 40. If two equal numbers are excluded, the mean becomes 56. Find the two missing numbers. 

Mean

The average score of girls in the preliminary examination is 75 and that of boys is 70. The average score of all the candidates in the examination is 72. Find the ratio of number of girls and boys that appeared in the examination.