The weight of coffee in 70 jars is shown in the following table:
Determine the variance and standard deviation of the above distribution.
Given, The data is given in table
To Find: Find the mean and, the variance of the frequency
Explanation: Here, the class interval in not continues frequency distribution, So we have to convert into continues frequency distribution by subtracting 0.5 from the lower limit and adding 0.5 to the upper limit then we get,
Now, N=70, 
, 
Mean 
Variance = 0.98
Standard Deviation 
SD = 0.99
Hence, The standard deviation is 0.99
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