Average Questions

The bodyweight of eight members of a club is recorded as 69kg, 63kg, 72kg, 76kg, 82kg, 93kg, 59kg, and 55kg. What is the average body weight of all the eight members?

What is the average of the following numbers?
20.54,11.51,13.71,18.31,17.53

Find the average of the prime numbers lying between 68 and 96.

The average weight of 35 students in a class increases by 2kg, when one of the students weighing 35kg is replaced by a teacher. What is the weight of the teacher?

Three boys, on an average, are $25$ years old, and their ages are in the ratio of $3:5:7$. What is the age of the youngest boy?

What is the value of x if the mean of 21, 26, 49 and x is 32?

What is the average of the first 10 prime numbers?

In nine games, A wins five games with score differences of 12, 3, 8, 4 and 1, while in the remaining four games, he loses with score differences of -4, -1, -2 and -3. The average score difference of A in all the nine games is:

The average height of a group of 9 students is $168\text{cm}$. Two more students of height $174\text{cm}$ and $184\text{cm}$ join the group. What is the new average (in cm)?

The average weight of 29 students in a class is $54\text{kg}$. Five students of average weight $52.8\text{kg}$ leave the class and 6 students of average weight $55\text{kg}$ join the class, what is the average weight (in kg) of students now?

The average age of 4 members of a family is 35 years. Their ages are in the ratio $8:7:1:12$. What is the age of the oldest member of the family (in years)?

There are six numbers whose average is 120. If the sixth number is one-fourth of the sum of the remaining five numbers, then the sixth number is:

If the average of six consecutive odd natural numbers is 24, then what is the average of the four smaller numbers out of the six numbers?

The average of five numbers is 30. If one number is excluded, the average becomes 31. What is the excluded number?

In a class, the average marks of girls in an examination is 75 and that of the boys is 64. The average score of the whole class is 68.4. What is the percentage of the girls in the class?

The average of n numbers is 55. If 70% of the numbers are decreased by 3 each and the remaining numbers are increased by 5 each, then what is the average of the resulting numbers?

The average time taken by 6 athletes in a race is 1 minute 50 seconds. The winner completed the race in 1 minute 20 seconds. What is the average time taken by the other 5 athletes?

The average of 25 integers is zero. What is the maximum possible number of positive integers?

In a medical institute, the strength of the students in the first two classes are in the ratio of 8:17. The ratio of the number of students in the second and the third classes is 2:3. What is the average of the number of students in the first and third classes, if the number of students in the second class is 612?

The batting average for $30\text{ innings}$ of a cricket player is $40\text{ runs}$. His highest score exceeds his lowest score by $100\text{ runs}$. If these two innings are not included, the average of the remaining $28\text{ innings}$ is $38\text{ runs}$. Then the lowest score of the player is:

The average of $15$ numbers is $56$. The average of the first $8$ numbers is $54.4$ and that of the last $8$ numbers is $56.6$. If the $8^{\text{th}}$ number is excluded, then what is the average of the remaining numbers? (correct to one decimal place)

The average of twenty positive numbers is $x$. If each number increases by $20\%$, then $x$ will:

The average weight of $10$ students is $42\text{kg}$. If $3$ students of average weight of $43\text{kg}$ are added and two other students of average weight of $48\text{kg}$ are also added, then find the average weight of all the students.

The average weight of 30 students in a class is 60kg. If the weight of the class teacher is included, the average increases by 0.5kg. The weight (in kg) of the teacher is:

The average marks obtained by a group of $25$ students was $24$. One student left the group as a result of which the average of the remaining students rose to $25$. But another student came in as a result of which the average marks of the group dropped a bit and became $24.8$. What was the average marks obtained by the student who left and the one who joined later?

The average of a set of 20 consecutive integers is 21.5. What is the smallest integer in the set?

Study the given graph and answer the following question.
Suppose the total production of barley over 4 years is 500 tonnes, and the average production of wheat, rice, and barley in 2017 is 120 tonnes.

45% of the total production of barley in the given 4 years is what per cent more than the average production (per year) of wheat, rice and barley in 2017?

The average of 37 numbers is 80. The average of the first 19 numbers is 75 and the average of the last 19 numbers is 84. If the 19
th
number is excluded, what is the average of the remaining numbers (approximate to one decimal place)?

The scores of a cricket team in five matches are given as $165,210,185,240,$ and $175$. If the team needs a combined average score of $200\text{ runs}$ across six matches to qualify, how many runs must it score in the sixth match?

A car travels the following distances on four consecutive days:
* Day 1: $120\text{km}$
* Day 2: $95\text{km}$
* Day 3: $145\text{km}$
* Day 4: $140\text{km}$

What is the average distance covered per day?

A man's pension on retirement from service is equal to half the average salary during the last $3\text{ years}$ of his service. His salary from 1-1-1983 is $\text{₹ }380$ per month, with increment of $\text{₹ }40$ due on 1-10-83, 1-10-84 and 1-10-85. If he retires on 1-1-86, what pension does he draw per month?

The average age of 10 members of a family is 29 years. If the youngest members are twins and each is 5 years old, what was the average age (in years) of the family members at the time of birth of the twins?

The average weight of the students in a class is 56 kg. If five more students whose average weight is 58 kg, join the class, the average weight of the students increases by 0.5 kg. What was the original number of students in the class?

Find the average of all prime numbers between 42 and 75.

Find the average of 642, 253, 834 and 303.

The average of 7 consecutive numbers is 20. The largest of these numbers is:

The average ages of boys and girls in a class are $14.5$ years and $15$ years respectively. If the ratio of the number of boys and girls is $2:3$, then what is the average age (in years) of all students in the class?

Seven persons have 20,30,40,50,60,70 and 80 chocolates with them. If each of them is given 5 chocolates additionally, what will be the average number of chocolates with them?

The average number of chocolates with six children is six. If another child joined them then the average number of chocolates with the seven children will become 7. What is the number of chocolates with the seventh child?

The average of twelve numbers is $62$. The average of the last five numbers is $60$ and that of the first four numbers is $64$. The sixth number is $8$ less than the fifth number and $7$ less than the seventh number. What is the average of the sixth and seventh numbers?

A, B, C, D, E and F are six consecutive even numbers. If the sum of A and F is $1586$, then what is the sum of all the numbers?

At a fitness club, 70% of the members are men and 30% of the members are women. If the average age of the men is 30 years and that of the women is 40 years, then what is the average age of all the members?

Find the average of the first 18 multiples of 9.

The average age of a group of $8$ people is $20\text{years}$. One person leaves the group and the average age becomes $18\text{years}$. Find the age of the person who left.

The average of $10$ consecutive odd numbers is $54$. Find the sum of the fifth and seventh numbers.

The average of the squares of the natural numbers from 1 to 11 is _________.

The average of $7$ numbers is $30$. If one number is excluded, the average becomes $31$. What is the excluded number?

$\text{L, M, N, O and P}$ are five consecutive odd numbers. If the sum of all these numbers is $2295$, what is the sum of $\text{L}$ and $\text{P}$?

A car owner buys petrol at ₹ 40, ₹ 50 and ₹ 60 per litre for 3 consecutive years. If he spends ₹ 30,000 each year, what is the average cost of a litre of petrol? (correct to two decimal places)