The following are the marks obtained in Maths by students of Class 8: 51, 94, 34, 20, 50, 81, 81, 90, 76, 34, 51, 86, 93, 99, 26, 54, 85, 71, 88, 40, 44, 56, 55, 57, 78, 53, 81, 78, 65, 78.The data have to be grouped to find the mean marks. One of the class intervals made is 60-70.What is the frequency of the last class interval?

The following are the marks obtained in Maths by students of Class 8:

1.	The following are the marks obtained in Maths by students of Class 8: 51, 94, 34, 20, 50, 81, 81, 90, 76, 34, 51, 86, 93, 99, 26, 54, 85, 71, 88, 40, 44, 56, 55, 57, 78, 53, 81, 78, 65, 78.The data have to be grouped to find the mean marks. One of the class intervals made is 60-70.What is the frequency of the last class interval?
Answer» The following are the marks obtained in Maths by students of Class 8: 51, 94, 34, 20, 50, 81, 81, 90, 76, 34, 51, 86, 93, 99, 26, 54, 85, 71, 88, 40, 44, 56, 55, 57, 78, 53, 81, 78, 65, 78. The data have to be grouped to find the mean marks. One of the class intervals made is 60-70. What is the frequency of the last class interval?