maths, statistics
posted by eimear .
The yearly mileage accumulated by an automobile in a large car rental company’s ﬂeet is normal with mean 18000 kilometres and standard deviation 1700 miles. At the end of the year the company sells 80% of its cars, keeping the 20% with the lowest mileage. Do you think a car whose yearend mileage is 17400 k.m. is likely to be kept?

This is just Z table stuff. You can play around with the values at
http://davidmlane.com/hyperstat/z_table.html 
Another method.
Z = (scoremean)/SD = (1740018000)/1700 = ?
Look in the back of your statistics textbook for a table called something like “area under normal distribution” to find the proportion/probability related to the Z score.
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