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The detail of a class test are as given below :

Marks-------------- no. of students 2------------------4 3------------------7 4-----------------10 5-----------------15 6-----------------8 7-----------------5 8-----------------1 What will be the average marks of the class ?

Total mark: 235. Total students: 50. Average mark: 4.7

applying the formula of mean for descrete series.. summation of fx/N 235/50=4.7

total marks = 8+21+40+75+48+35+8=235 total students=50 so average marks of the class= 235/50 =4.7

A pupil's marks were wrongly entered as 83 instead of 63. Due to that the average marks for the class got increased by half (1/2). What is the number of pupils in the class?

The rate of autometres in Baroda are given below For first 2 km Rs 25/- is fixed and every next km Rs 8/- per km. What will be the total length of journey for which average is Rs 10/- per km ?

The average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60. What is the average marks of all the students?

In a class of 20 students in an examination in Mathematics 2 students scored 100 Marks each, 3 get zero each and the average of the rest was 40.

What is the average Of the whole class?