How to count mean and standard deviation ?

J

Jophy Tee

New member
80 batteries produced in the morning shift and 100 batteries produced in the afternoon shift in a factory had their lifespans tested.

morning shift--->mean=16.7 hours ; standard deviation=2.3 hours
afternoon shift--->mean=18.2 hours ; standard deviation=1.9 hours

Calculate the mean and standard deviation for the lifespans of all the batteries.

Thanks anyone who helping :)
 
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