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1)There are teo boxes. One with 6 balls number 1-6 and one with seven numbered 1-7. If they are thoroughly shaken and ball is drawn from each, what is the probability that
(a) Both will be 1's
(b) Exactly one of the will be a 2
(c) Both will be even
(d) Exactly one of them will be even?
(e) At least one of them will be even

Here what is the sample space? I have doubt in that...
2)Rachel scored 456 on the national college enterance exam for which the mean is 500 with standard deviation 50. Raymond scored 25 on the BAt testm which has a mean of 30 with a standard deviation of 6. If Hudson college weighs these two examinations equally, which student has the best chance of being admitted to Hudson?

3)If a variable is normally distributed, aproximatley what percentage of its values will lie more than 2 standard deviations away from teh mean? What percentage will lie more htan 1 standard deviation above the mean?
Thanks

2006-11-12 02:15:52 · 3 answers · asked by magt_g 1 in Science & Mathematics Mathematics

3 answers

1) this operation is made up of two steps, that means the probablility of the whole operation = the multiplication of the probablility of every step
a) probaility of a 1 from the first box = 1/6, the other box = 1/7 , so P(Both will be 1's) = 1/7 * 1/6

b) p(Exactly one of the will be a 2) = 1/6 * 6/7 + 1/7 * 5/6

c) P(Both will be even) = 3/6 * 3/7
d) P( Exactly one of them will be even) = 3/6 *4/7 + 3/6 * 3/7

e) P(At least one of them will be even) = 1- both of the odd = 1- (3/6 * 4/7)

>> as for the sample space it would take me forever to write it down! sorry

2) Not sure about this one
3) a) 5%
b) 16% >> dont know wut details to include its just a law

2006-11-12 02:54:39 · answer #1 · answered by DuDeTte 2 · 0 0

You should read your book first. What do you take stats if you can not solve this trivial problems?

2006-11-12 10:47:39 · answer #2 · answered by Dr. J. 6 · 0 0

ask your teacher that's what they're there for

2006-11-12 10:25:36 · answer #3 · answered by Dreamweaver 5 · 0 0

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