CBSE Class 10-Mathematics: Chapter – 14 Statistics Part 8 (For CBSE, ICSE, IAS, NET, NRA 2022)
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Question 11:
Construct the cumulative frequency distribution of the following distribution:
Class Interval | |||||||
Frequency |
Answer:
The required cumulative frequency distribution of the given distribution is given below:
Classes | Frequency | Cumulative Frequency |
Question 12:
Calculate the median from the following data:
Marks | |||||
No. of students |
Answer:
We have
Marks | No. of students (f) | C. F |
Since which is in the class
Median class is
We know that median Me is given by
Here,
Hence, median
Question 13:
Find the mean of the following data:
Classes | |||||
Frequency |
Answer:
We have
Classes | Frequency | ||
Now Mean
Question 14:
A survey conducted on households in a locality by a group of students resulted in the following frequency table for the number of family members in a household. Find the mode.
Family size | |||||
No. of families |
Answer:
Since the maximum frequency and it corresponds to the class
Modal class
Here,
We know that mode Mo is given by