Home
Class 12
MATHS
In a class of 100 students there are 70 ...

In a class of 100 students there are 70 boys whose average marks in subject are 75. If the average marks of the complete class are 72, then the average marks of the girls

A

73

B

65

C

68

D

74

Text Solution

Verified by Experts

The correct Answer is:
B
Total students =100
Total marks of 70 students is `75xx70=5250`.
Total marks of girls is 7200-5250=1950
So average of girls is
`(1950)/(30)=65`
Promotional Banner

Topper's Solved these Questions

  • STATISTICS

    CENGAGE PUBLICATION|Exercise Exercise 11.2|6 Videos

  • STATISTICS

    CENGAGE PUBLICATION|Exercise Exercises|39 Videos

  • STATISTICS

    CENGAGE PUBLICATION|Exercise Archives|10 Videos

  • SOLUTIONS AND PROPERTIES OF TRIANGLE

    CENGAGE PUBLICATION|Exercise Comprehension Type|6 Videos

  • STRAIGHT LINE

    CENGAGE PUBLICATION|Exercise Multiple Correct Answers Type|8 Videos

Similar Questions

Explore conceptually related problems

There are 25 boy students and 20 girls students in a school. The average of marks in math of 25 boy students is 52 and the average of marks in math of 20 girl-students is 48. Find the average of marks obtained by the students of the school as a whole.

The number of students in a class is 60 . The average of the ages of the boy-students is 14.5 years and the average of the ages of the girl-students is 16 years . If the collective average of the total students be 15 years , then find the number of boy-students and the number of girl-students.

The marks obtained by 30 students in a examination of a class are given below . Find their average.

Class mark of a class is

A student obtain 75%, 80% and 85% in three subjects if the marks of another subject are added. Then the average cannot be less than

The average of the weights of 150 students is 50 kilogram. The average of the weights of the boy students is 55 kilograms and the average of the weigths of the girls students is 42.5 kilogram . Find the number of boy and girl students.

The average of the collective ages of 4 classes in a school is 8.5 years. The number of students of 4 classes are 32.30, 29 and 27. If the average of the classes of the first, second and third be 6.8 years, 7.5 years and 8.2 years respectively , then find the average of ages of the students of class-IV.

Last year 75 boys and 50 girls of a school appeared in Madhyamik Examination. The average marks obtained by two groups of students was founds to be 65 and 70. Find the average marks obtained by all students.

It depends upon the demand of the situation whether we are interested in finding the average marks obtained by the students or the marks obtained by most of the students What do we find in the second situation?

It depends upon the demand of the situation whether we are interested in finding the average marks obtained by the students or the marks obtained by most of the students What do we find in the first situation?