CBSE Class 10-Mathematics: Chapter – 14 Statistics Part 16 (For CBSE, ICSE, IAS, NET, NRA 2022)

Doorsteptutor material for CBSE is prepared by world's top subject experts: fully solved questions with step-by-step explanation- practice your way to success.

Question 13:

Calculate the mean for the following distribution:

Calculate the Mean for the Following Distribution
Class Interval
Frequency2

Answer:

By Step deviation Method

Let assumed mean

Calculate the Mean for the Following Distribution
Class intervalMid-value Frequency Deviation

Product
Total

We know that Mean

Question 14:

The percentage of marks obtained by students in an examination are given below:

The Percentage of Marks Obtained by 100 Students in an Examination Are Given Below
Marks
Frequency

Determine the median percentage of marks.

Answer:

Determine the Median Percentage of Marks
Class intervalMid-value Frequency Deviation

Product
Total

We know that Mean

Therefore , which lies in the class

(The lower limit of the median class)

(The cumulative frequency of the class preceding the median class)

(The frequency of the Median class)

(The class size)

Median

So, the median percentage of marks is