NCERT Class 11-Math՚s: Exemplar Chapter – 15 Statistics Part 2 (For CBSE, ICSE, IAS, NET, NRA 2022)
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Question 2:
Find the variance and standard deviation for the following data:
Answer:
Standard deviation
Question 3:
Show that the two formulae for the standard deviation of ungrouped data.
Are equivalent.
Answer:
We have
Dividing both sides by n and taking their square root, we get .
Question 4:
Calculate variance of the following data:
| Class interval | Frequency |
Answer:
Long Answer Type
Question 5:
Calculate mean, variation and standard deviation of the following frequency distribution:
| Classes | Frequency |
Answer:
Let A, the assumed mean, be . Here
| Classes | |||||
Variance