Math Is Fun Forum

finitehelp

Member

Registered: 2009-06-21

Posts: 80

Probability Help

1.    Finding Probability from Odds If the actual odds against event A are a: b,  P( A) = b/( a + b).
then Find the probability of the horse Cause to Believe winning the 132nd Kentucky Derby, given that the actual odds against his winning that race were 97: 3.

2.    Are these events disjoint? Randomly selecting a fruit fly with red eyes Randomly selecting a fruit fly with sepian ( dark brown) eyes.
3.    If events A and B are disjoint and events B and C are disjoint, must events A and C be disjoint? Give an example supporting your answer.
4.    Are these events dependent? Finding that your cell phone works Finding that your car starts
5.    The FICO ( Fair Isaac & Company) score is commonly used as a credit rat-ing. There is a 1% delinquency rate among consumers who have a FICO score above 800. If four consumers with FICO scores above 800 are randomly selected, find the probability that at least one of them becomes delinquent.
6.    How many ways can the letters of Baggy be arranged?

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Probability Help

Hi;

5) This is done with binomials.

6)

The letters B A G G Y can be arranged in 5! / 2! ways.

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

finitehelp

Member

Registered: 2009-06-21

Posts: 80

Re: Probability Help

thanks bobbym. Can anybody hep with the rest????

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Probability Help

4) These events are independent because the fact that your cell phone works does not affect the probability that your car starts.

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.