A certain type of storage battery lasts, on average, 3.5 years with a standard deviation of...
A certain type of storage battery lasts, on average, 3.5 years
with a standard deviation of 0.5 year. Assuming that ‘battery life’
is normally distributed, what percentage of batteries last between
3.0 and 4.0 years?
Homework Answers
=P[-1<Z<1]
=0.8413-0.1587.......................by using Z table.
=0.6826
Therefore, 68.26% of batteries last between 3.0 and 4.0 years.
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