UP SI MATHS QUIZ

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Question 1:

The average of 25 results is 18. The average of the first 12 is 14 and the last 12 is 17. What is the 13th result?

Question 2:

The average of 19 numbers is 58 . The average of the first 12 numbers is $63.6$ and the average of the last 8 numbers is $55.1$. If the 12 th number from the beginning is excluded, then what is the average of the remaining numbers?

Question 3:

The average of seven odd numbers, taken in increasing order, is 79 . What is the average of the first five numbers?

Question 4:

The average age of 26 students in a class is 15 years. If the teacher's age is included in it, then the average will increase by one. What is the teacher's age (in years)?

Question 5:

The average of 10 observations is 46 . It was realised later that an observation was misread as 42 in place of 142 . The correct average is

Question 6:

The average of three numbers a, b and c is 63 . If the first number ' a ' is three-fourth of the sum of b and c, then the first number ' a ' is equal to:

Question 7:

The average of 9 numbers is 51 . Average of three of them is 49 and the average of four of the remaining numbers is 46 . What is the average of the remaining numbers?

Question 8:

A library has an average of 240 visitors on Sundays and 150 visitors on other days. The average number of visitors per day in a month of 30 days, which begins with Monday, is:

Question 9:

The difference between the average of all those numbers between 50 and 7 which are divisible by 6 and the average of all prime numbers between 10 and 45 is

Question 10:

The average of eleven consecutive positive integers is d. If the last two numbers are excluded, by how much will the average increase or decrease?