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Old 03-08-2014, 05:50 AM
ScorpioAB ScorpioAB is offline
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Join Date: Jan 2013
College: University of Washington
Posts: 16
Question Help plz! Given pdf to estimate prob. of small interval

From an online study material, an example question under Age-At-Death RV.

An age-at-death random variable is modeled by an exponential random variable
with PDF f(x) = 0.34e^0.34x; x >= 0. Use the given PDF to estimate
Pr(1 < X < 1:02).

The answer is just one line:
Pr(1 < X < 1.02)  0.02*f(1) = 0.005

Could anyone tell me how this is derived???

Thanks!

BTW it's interesting that exam MLC has been revised for several times, from pencil & paper MC to almost CBT, and now it contains both MC and WA.
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