Posted by **padma.c** on Tuesday, October 11, 2011 at 6:04am.

A random experiment of tossing a die twice is performed. Random variable X on this

sample space is defined to be the sum of two numbers turning up on the toss. Find the

discrete probability distribution for the random variable X and compute the corresponding

mean and standard deviation.

- probability -
**Damon**, Tuesday, October 11, 2011 at 6:23am
36 possibilities

number of times sum

1 * 2 = 2

2 * 3 = 6

3 * 4 = 12

4 * 5 = 20

5 * 6 = 30

6 * 7 = 42

5 * 8 = 40

4 * 9 = 36

3 * 10= 30

2 * 11= 22

1 * 12= 12

-----------

36 and 252

mean = 252/36 = 7

go ahead and compute sigma

- probability -
**Paul**, Tuesday, March 6, 2012 at 7:50pm
A dictionary contains 80,000 words, of which a certain student knows 30,000. If 100 of the 80,000 words are selected at random from the dictionary without replacement, find the probability:the student knows exactly 40 of the 100 words

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