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The car battery has an average life time of $\"\"$ months and the standard deviation of $\"\"$ months.

The probability of battery of last seen $\"\"$ months and $\"\"$ months.

Consider the limits of integral is $\"\"$ months and $\"\"$ months.

The function is $\"\"$ .

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Power rule of integral : $\"\"$ .

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Graph:

The integral function is $\"\"$

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Observe the graph,

Area of the region is $\"\"$ sq-units. \ \

$\"\"$ .

Probability of the battery that will last between 48 months to 60 months is $\"\"$ .

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$\"\"$ .

Probability of the battery that will last between 48 months to 60 months is $\"\"$ .