Question

how A is obtained in assumed mean method

Answer 1

Answer:

Step-by-step explanation:

In assumed mean method a is the mean which we have to assumed it is nearly the half of class mark or xi

Answer 2

Answer:

Step-by-step explanation:first arrange all the class, marks and frequency in columnar form.

Then obtain the column of xi I.e. Class marks by upper limit - lower limit /2

Then take the middle column in the class marks column and you get your 'a'