Find standard deviation from frequency table
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firstly you have a mid point if each.
For 5-9 its (5+9)/2 which is 7, for 10-14 it is 12 and soon .... 7---9 12---11. 17---10. 22---20. 27---10 32---12 37---6 42---3 47---1 52---1 57---2 62---3 67---0 and you find your value by a formula (sum of (frequency* value))| (( frequency))
For 5-9 its (5+9)/2 which is 7, for 10-14 it is 12 and soon .... 7---9 12---11. 17---10. 22---20. 27---10 32---12 37---6 42---3 47---1 52---1 57---2 62---3 67---0 and you find your value by a formula (sum of (frequency* value))| (( frequency))
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