The following table shows the marks scored by 140 students in an examination of a certain paper:

Calculate the average marks by using all the three methods: direct method, assumed mean deviation and shortcut method.

Question

Philoid · Accepted Answer

From Direct method:

= 25.857

Assumed mean method:

let assumed mean (A) = 25

= 25 + 0.857

= 25.857

Step deviation method:

Let the assumed mean (A) = 25

= 25 + 0.857

= 25.857

The following table shows the marks scored by 140 students in an examination of a certain paper:Calculate the average marks by using all the three methods: direct method, assumed mean deviation and shortcut method.