CBSE Class 10-Mathematics: Chapter –14 Statistics Part 16
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Question 13:
Calculate the mean for the following distribution:
Class Interval | ||||||||
Frequency | 2 |
Answer:
By Step deviation Method
Let assumed mean
Class interval | Mid-value | Frequency | Deviation | Product |
Total |
We know that Mean
Question 14:
The percentage of marks obtained by students in an examination are given below:
Marks | |||||||
Frequency |
Determine the median percentage of marks.
Answer:
Class interval | Mid-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