NCERT Class 11-Math's: Exemplar Chapter –15 Statistics Part 2
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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