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anonymous
 5 years ago
The following table shows the probability of rolling the numbers 1 through 7 on a fair sevensided die.
X 1 2 3 4 5 6 7
P(X) 1/7 1/7 1/7 1/7 1/7 1/7 1/7
What is the standard deviation of the random variable X, "the number that comes up on the die?"
anonymous
 5 years ago
The following table shows the probability of rolling the numbers 1 through 7 on a fair sevensided die. X 1 2 3 4 5 6 7 P(X) 1/7 1/7 1/7 1/7 1/7 1/7 1/7 What is the standard deviation of the random variable X, "the number that comes up on the die?"

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.01/7 ? im not sure about deviation

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0lol me neither...but i know its a decimal i forgot how to do the work for this...

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0nvmmmm its 2.0 ! gah..

shadowfiend
 5 years ago
Best ResponseYou've already chosen the best response.1It's kind of a pain, but to find the standard deviation you have to square the difference of each point to the mean, then find the mean of those numbers, and finally take the square root. I think in this case we would see a mean of 4 ((1+2+3+4+5+6+7)/7). So you'd square 14, 24, 34, 44, etc, then add those up and divide by 7 to find their mean, then take the square root of that (which will indeed get you 2).

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0I remember now! Thanks
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