Mean of Ungrouped Frequency Distribution by Assumed Mean Method

Q. Find the mean of the following frequency distribution using assumed mean method:

1. 17.7
2. 18.8
3. 19.9
4. 19

Q.

Calculate the Mean of the given distribution, using Assumed mean Method.

$\begin{array}{cc}\text{Marks}& \text{No. of Students}\\ 10-20& 2\\ 20-30& 6\\ 30-40& 10\\ 40-50& 12\\ 50-60& 9\\ 60-70& 8\\ 70-80& 4\\ 80-90& 3\end{array}$

1. 48.89
2. 46.5
3. 55
4. 52.11

Q. The following data give the number of boys of a particular age in a class of 40 students. Calculate the mean age of the students by assumed mean method.
Age (in years) Number of students

13	3
14	8
15	9
16	11
17	6
18	3

1. 17.25
2. 15.45
3. 16.55
4. 18.35