the following table gives the lifetime of 200 bulbs.Calculate the mean life of a bulb by step deviation method
life time [in hrs]: 400-499    500-599   600-699  700-799   800-899  900-999
frequency:             24            47          39           42         34         14
i wanted to check whetjer my answer is correct! pls do it taking values of  [A=749.5 and h=200]
plssssss do it with my values 

Asked by my3shyll | 16th Jul, 2016, 04:24: PM

Expert Answer:

 Class size (h)= 100....(Since the class size that is the difference between the upper limit and the lower limit of each class interval is  100)
 Here A = 749.5 and h = 100

Answered by Rebecca Fernandes | 17th Jul, 2016, 08:53: PM

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