Originally Posted by

**math321** hey guys i got a final exam on wednesday and i am working on some practice questions

jus need some help in doing this 1 dont really care about the answer

i jus want the steps in solving this

every now and again even a good diamond cutter has a problem and the diamond breaks for one particular cutter the rate of breakage is 0.1

i. give reasons why the binomial probability model is suited for this problem

if the cutter works on 75 stones

a. what is the probability that he breaks exactly 3 stones

b. what is the probability that he breaks 2 or more stones

c. find the mean of this distribution

d. find the stand dev of this distribution