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January 31st, 2012, 11:05 AM   #1
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Can someone help me find the dispersion or variability in...

I need to find the variability or dispersion in this probability equation

0.97*0 + 0.02*1 + 0.01*2 =0.04

Any help?
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January 31st, 2012, 11:06 AM   #2
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Re: Can someone help me find the dispersion or variability i

The original problem

There is a .97 chance that no accident will occur during any particular day at a racetrack of local importance. the probability of one accident a day is .02, and the probability of two accidents is .01.

a. What is the expected number of accidents in a day?
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January 31st, 2012, 10:43 PM   #3
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Re: Can someone help me find the dispersion or variability i

Variance is
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