# Standard deviation

Find standard deviation for dataset (grouped data):

Age (years) No. Of Persons

0-10 15

10-20 15

20-30 23

30-40 22

40-50 25

50-60 10

60-70 5

70-80 10

Age (years) No. Of Persons

0-10 15

10-20 15

20-30 23

30-40 22

40-50 25

50-60 10

60-70 5

70-80 10

**Result****Leave us a comment of example and its solution (i.e. if it is still somewhat unclear...):**

**Showing 1 comment:**

**Dr Math**

Check also with our stddev calculator - input is given as frequency table:

https://www.hackmath.net/en/calculator/standard-deviation?input=5+15+25+35+45+55+65+75%0D%0Af%3A15+15+23+22+25+10+5+10

x is Mid Interval Value and f is frequency

https://www.hackmath.net/en/calculator/standard-deviation?input=5+15+25+35+45+55+65+75%0D%0Af%3A15+15+23+22+25+10+5+10

x is Mid Interval Value and f is frequency

#### To solve this example are needed these knowledge from mathematics:

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