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

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Question 13:

Calculate the mean for the following distribution:

Answer:

By Step deviation Method

Let assumed mean

We know that Mean

Question 14:

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

Determine the median percentage of marks.

Answer:

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