 |
|
| Browse | Ask | Answer | Search | Join/Login |
|
|
||||
|
Are they being drawn at the same time. As there are no instructions on that, I'll assume they are not.
I don't know the name of what I'll be using in english but you have got to do a diagram. On the 1st part of the diagram, it is divided in 2 parts (one for white and one for black). The white starts with 5/12 (probability of the 1st ball being white), then it is 4/11, assuming the 1st ball was white, then ends with 3/10. Now 5/12*4/11*3/10=60/1320 which is equal to 6/132=3/66=1/12. This is the probabilty of all of them being white. Now for the second part of the question, the first ball is white, therefore it starts with 5/12. But now the second one is black, so it is 7/11 (the 7 black balls are still there, but there are 11 in total because the white was removed). The third one will therefore be 6/10. Once again, 5/12*7/11*6/10= 210/1320= 21/132= 7/41. I don't renember this quite well because it was sometime ago, but I think this is right. |
||||
| Question Tools | Search this Question |
Add your answer here.
Check out some similar questions!
in a survey conducted at local restaurant during breakfast hours, 20 people preferred orange juice, 16 preferred grapefruit juice, and 9 preferred apple juice with breakfast. If a person is selected at random, find the probability that he or she prefers grapefruit juice.
Q If 3 books are picked at random from a shelf containing 5 novels, 3 books of poems, and a dictionary, what is the probability that (a) The dictionary is selected? (b) 2 novels and 1 book of poems are selected?
:confused: A sample of 100 wood and 100 graphite tennis rackets are taken from the warehouse. If 10 wood and 19 graphite are defective and one racket is randomly selected from the sample, find the probability that the racket is wood or defective.
a six sided dicen numbered 1-6 is rolled. What's the probability that the roll results in an odd number or a number less than 4?
In a study of 685 cars in a parking lot, there were only 3 different types: sedan,sports car and mini van. 211 of the cars were mini vans. Use this information to estimate the probability of choosing a car that is a sedan or sports car.
View more questions Search
|
