statistics
posted by Jessica .
Drivers pay an average of (mean $690) per year for automobile insurance the distribution of insurance payments is approximately normal with a standard deviation of 110 dollars. What proportion of drivers pay more than 100 dollars per year for insurance?

statistics 
MathGuru
Use zscores.
z = (x  mean)/sd
x = 100
mean = 690
sd = 110
Plug the values into the formula, then use a ztable to determine the proportion.
I hope this will help get you started.
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