Homework Help: statistics

Posted by please help me! on Tuesday, March 23, 2010 at 2:20pm.

Find the indicated binomial probabilities. Round to the nearest 3 decimal places.

In a local college, 20% of the math majors are women. Ten math majors are chosen at random.

1) What is the probability that exactly 2 are women?

2) What is the probability that 2 or less women are selected?

3) What is the probability that no women are selected?

4) Find the mean u

5) Find the variance o2

statistics - Reiny, Tuesday, March 23, 2010 at 5:08pm
Prb(woman) = .2
prb(man) = .8

1)choosing 10 ...
prob(exactly 2 women) = C(10,2)(.2)^2(.8)^8
= .302

etc.

Also look at the reply to the next post, I think it is your post.

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