Posted by **Rose Bud** on Wednesday, February 29, 2012 at 12:35am.

Nine apples, four of which are rotten, are in a refrigerator. Three apples are randomly selected without replacement. Let the random variable x represent the number chosen that are rotten. Construct a table describing the probability distribution, then find the mean and standard deviation for the random variable x.

question: WHAT STEPS WERE USED TO GET THE ANSWER?

this is the table

X P(x)

0 0.167

1 0.500

2 0.300

3 0.033

- Elementary statistics -
**David**, Wednesday, February 29, 2012 at 12:40am
The total number of outcomes is 9C3, because there are nine apples and you are choosing 3 where order doesn't matter.

P(0) = 5C3 / 9C3

because there are 5 good apples and you need to choose 3.

P(1) = 5C2*4C1 / 9C3

P(2) = 5C1*4C2 / 9C3

P(3) = 5C0*4C3 / 9C3

- Elementary statistics -
**Rose Bud**, Wednesday, February 29, 2012 at 1:09am
THANK YOU SO MUCH I have been stumped on this question for hours on two different occasions, I am so glad you cleared this up for me.

## Answer This Question

## Related Questions

- Math - A bag of five apples contains three ripe apples and two rotten apples. If...
- Math - Apples are sold in cartons of 25. David bought home 2 cartons an found 3 ...
- statistics - Three cards are randomly chosen, without replacement, from a ...
- Maths - In a basket of apples and oranges. 15% of te he fruits are rotten. 30% ...
- maths - 6 out of 20 apples were rotten what percentage of the apples were rotten...
- maths - a fruit seller buys 712 fruits ,of which 3/4 are apples. of all apples ...
- Probability - you need 4 eggs , there are 12 eggs in the refrigerator but do not...
- maths - from a batch of 10 eggs 3 are rotten.2 eggs are selected in succession....
- stats - A large shipment of Granny Smith apples arrives at a grocery store. ...
- Statistics - A batch consists of 20 bad apples and 80 good ones. What is the ...

More Related Questions