Average Mcqs

Q.  The average of 18 observations was calculated and it was 124. Later on it was discovered that two observations 46 and 82 were incorrect. The correct values are 64 and 28. The correct average of 18 observations is___________?

a. 123
b. 137
c. 121
d. 122


ANSWER: See Answer
 
Sum of 18 observations = 18×124 =2232

Correct sum of 18 observations = 2232-46-82+64+28

= 2196

Therefore, Correct average =2196/18 = 122
MCQs:  The average of five numbers is 27. If one number is excluded, the average becomes 25. The excluded number is__________?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A library has an average of 510 visitors on Sunday and 240 on other days. The average number of visitors per day in a month of 30 days beginning with a Sunday is___________?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A family consists of grandparents, parents and three grandchildren. The average age of the grandparents is 67 years, that of the parents is 35 years and that of the grandchildren is 6 years. What is the average age of the family?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  The average of five consecutive odd numbers is 61. What is the difference between the highest and lowest numbers?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  The average of non-zero number and its square is 5 times the number. The number is__________?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  The average of the two-digit numbers, which remain the same when the digits interchange their positions, is__________?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  The average of first five multiples of 3 is____________?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  Find the average of all the numbers between 6 and 34 which are divisible by 5.
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  Sarfaraz obtained 76, 65, 82, 67 and 85 marks (out of 100) in English, Mathematics, Physics, Chemistry and Biology. What are his average marks?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A total of 3000 chocolates were distributed among 120 boys and girls such that each boy received 2 chocolates and each girl received 3 chocolates. Find the respective number of boys and girls?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  Rs. 6000 is lent out in two parts. One part is lent at 7% p.a simple interest and the other is lent at 10% p.a simple interest. The total interest at the end of one year was Rs. 450. Find the ratio of the amounts lent at the lower rate and higher rate of interest?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A trader purchased two colour televisions for a total of Rs. 35000. He sold one colour television at 30% profit and the other 40% profit. Find the difference in the cost prices of the two televisions if he made an overall profit of 32%?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  The average weight of a group of persons increased from 48 kg to 51 kg, when two persons weighing 78 kg and 93 kg join the group. Find the initial number of members in the group?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  The total marks obtained by a student in Mathematics and Physics is 60 and his score in Chemistry is 20 marks more than that in Physics. Find the average marks scored in Mathematics and Chemistry together.
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  Five years ago the average of the ages of A and B was 40 years and now the average of the ages of B and C is 48 years. What will be the age of the B ten years hence?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  Aftab bought 65 books for Rs.1150 from one shop and 50 books for Rs.920 from another. What is the average price he paid per book ?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  The average height of 50 pupils in a class is 150 cm. Five of them whose height is 146 cm, leave the class and five others whose average height is 156 cm, join. The new average height of the pupils of the class (in cm) is __________ .
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  In an exam, Amir scored 64 percent, Masood scored 36 percent and asif 44 percent. The maximum score awarded in the exam is 800. Find the average mark scored by all the three boys?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  The average mark of the students of a class in a particular exam is 80. If 5 students whose average mark in that exam is 40 are excluded, the average mark of the remaining will be 90. Find the number of students who wrote the exam.
Category: Mathematics Quizzes,   Published by: T-Code Scripts