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Find the standard devation of the original data value 11.1 interval / 30-36   37-43 44-50 51-57...

Find the standard devation of the original data value 11.1

interval / 30-36   37-43 44-50 51-57 58-64 65-71 72-78   

Frequency/ 2 4 4 2 14 3 37

i need help plz ?!

math   Statistics-And-Probability   
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