Stats Homework Help please!?

Posted on 2015-10-22 07:57:00 in Statistics by NANCY

1. An urn contains 22 numbered balls. Of these, 15 are white and 7 are red. From this urn, we select 6 balls.
How many samples contain at least 2 red balls?

2. Evaluate.

(a) (? 16 ) 4

(b) (? 45 ) 0 ?

3. A director of a music video show wishes to play 4 rap videos and 3 R&B videos. He has 9 rap and 4 R&B videos to choose from.
If we consider the order in which the videos are played, how many different line-ups can the show have?

Note that no video can be used more than once.

4. Find the coefficient of the given terms in the binomial expansion of ?(x + y)^19.
(a) ?x^7?y^12
(b) ?x?y^18

5. On an assignment, students are expected to answer at least 2 questions from a 25 question set. But they can complete as many questions as they wish (for bonus!). How many possible ways can they complete the assignment?

6. An urn contains 40 balls. Some are red balls and the rest are white balls.

If the probability of extracting a red ball is 0.2, how many red balls are there?

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