14 Aug '06 14:22

The other day I baked a loaf of bread. To make it sweeter I put in some raisins. I only had 12 raisins to use so I put them all in.

The fresh loaf of bread was lovely. I instantly cut the loaf in 12 slices and I took one slice and made me a sandwich.

What is the probability that ...

(1) ... in my slice there was exactly *one* raisin?

(2) ... there was *none* in my slice?

(3) ... there was exactly *one* raisin in every slice?

If I wanted a probability of 90% that at least *one* raisin should be found in each slice of the lof of bread ...

(4) ... how many raisins should I use in the whole loaf of bread?

Now, I don't have the answers, I have to calculate exactly like you.

Please, give your reasoning along with your answers.

The fresh loaf of bread was lovely. I instantly cut the loaf in 12 slices and I took one slice and made me a sandwich.

What is the probability that ...

(1) ... in my slice there was exactly *one* raisin?

(2) ... there was *none* in my slice?

(3) ... there was exactly *one* raisin in every slice?

If I wanted a probability of 90% that at least *one* raisin should be found in each slice of the lof of bread ...

(4) ... how many raisins should I use in the whole loaf of bread?

Now, I don't have the answers, I have to calculate exactly like you.

Please, give your reasoning along with your answers.