The life time of the batteries manufactured by LG is normally distributed with a mean of...
The life time of the batteries manufactured by LG is normally distributed with a mean of 60 months and a standard deviation of 10 months.
(i) Find the percentage of batteries whose life time is less than 20 months.
(ii) Find the percentage of batteries whose life time exceeds 70 months.
(iii) How many batteries whose life time ranges from 45 to 75 months in a year when there is a production 5000 batteries in a year?
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