Monday

October 20, 2014

October 20, 2014

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

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 6:23am36 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 7:50pmA 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

**Answer this Question**

**Related Questions**

Math - An ordinary (fair) die is a cube with the numbers 1 through 6 on the ...

Statistics/probability - The random variable X has a binomial distribution with ...

probability - A fair coin is flipped independently until the first Heads is ...

arithmetic - Assume you roll a fair dice twice. Two rolls are independent and ...

math - a fair coin is flipped 5 times the random variable is x is defined to be ...

statistics - two dices are tossed once. let the random variable be t he sum of ...

arithmetic - Assume you roll a fair dice twice. Two rolls are independent and ...

math (statistics) - an experiment consistbnof tossing a die and then flipping a ...

Probability - For each of the following statements, determine whether it is true...

stor - Suppose that you flip a fair coin (P(H)=P(T)=1 2 ) three times and you ...