Q1 of 108 Page 32

Find the standard deviation for the following distribution :

Given, The data is given in table/

To Find: Find the standard deviation


The formula used: SD =


Explanation: Here, Mean =


Mean =



Now, N=70, ,






100[1.857-0.0987]


100[1.7583]



Standard Deviation



SD = 13.26


Hence, The standard deviation is 13.26


More from this chapter

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The mean and standard deviation of a group of 100 observations were found to be 20 and 3 respectively. Later on, it was found that three observations were incorrect, which were recorded as 21, 21 and 18. Find the mean and standard deviation if the incorrect observations were omitted.

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Show that the two formula for the standard deviation of ungrouped data

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Table below shows the frequency f with which ‘x’ alpha particles were radiated from a diskette


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Find the mean, and standard deviation for the following data :