Mathematics
marianabdillahi
2015-10-31 23:10:18
if a box contains 10 left-handed and 20 right-handed screws,what is the probability of obtaining at least one right-handed screw in drawing 2 screws with replacement?
ANSWERS
Prettyrock
2015-11-01 05:59:27

When you take the first screw the odds of getting a left handed one are 1/3 or 10/30 When you take the second screw the odds of getting a left handed one are 9/29 This means that the odds of getting 2 left screws is [latex] frac{10}{30} [/latex] x [latex] frac{9}{29} [/latex] = [latex] frac{3}{29} [/latex] This means that the odds of getting at least one right handed screw is 26/29

ADD ANSWER