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13.Statistics
normal
For a frequency distribution standard deviation is computed by applying the formula
A$\sigma = \sqrt {\left( {\frac{{\sum \,fd}}{{\sum \,f}}} \right) - \frac{{\sum \,f{d^2}}}{{\sum \,f}}} $
B$\sigma = \sqrt {\frac{{\sum \,f{d^2}}}{{\sum \,f}} - {{\left( {\frac{{\sum \,f{d^2}}}{{\sum \,f}}} \right)}^2}} $
C$\sigma = \sqrt {{{\left( {\frac{{\sum \,fd}}{{\sum \,f}}} \right)}^2} - \frac{{\sum \,f{d^2}}}{{\sum \,f}}} $
D$\sigma = \sqrt {\frac{{\sum \,f{d^2}}}{{\sum \,f}} - {{\left( {\frac{{\sum \,fd}}{{\sum \,f}}} \right)}^2}} $
Solution
(d)It is obvious.
Standard 11
Mathematics
Similar Questions
Find the standard deviation for the following data:
| ${x_i}$ | $3$ | $8$ | $13$ | $18$ | $25$ |
| ${f_i}$ | $7$ | $10$ | $15$ | $10$ | $6$ |
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