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anonymous
 5 years ago
The accompanying table shows the scores on a classroom test. What is the population standard deviation
x: 100, 95, 90, 80, 75, 72, 70
f: 7, 2, 10, 4, 2, 3, 4
anonymous
 5 years ago
The accompanying table shows the scores on a classroom test. What is the population standard deviation x: 100, 95, 90, 80, 75, 72, 70 f: 7, 2, 10, 4, 2, 3, 4

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0ooh statistics.....dont remember this but tiere's a formula for Standard Deviation...google it lol

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0f stands for frequency, so that's the number of x' of that particular value that occurred. So x = 100 occurred 7 times in the population. x = 95 occurred twice. And so on. Find the mean of your population is the first step. That means summing over all the scores of the class and dividing by the class size.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0\[\sum_{n=1}^{3}i^(n1)\]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0that should read i^(n1)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0What is that sum for formula for?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0the top part means you do the formula on the right 3 times using n=1 n=2 n=3 and then add up all those values

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0but the i is raised to the n1

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0What's the formula represent? Is this a different problem? I thought you were asking about standard deviation.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0yeah its a different problem i figured out the other one ill use my calculator

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0So what's the sum asking you to do? You want to find an explicit formula for the sum?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0no you need to find the sum of all those terms

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0I have a feeling you wrote the problem wrong. As it is, it makes no sense. Unless the teacher just wants you to write: i^(0) + i^(1) + i^(2). That's the sum.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0yeah u do i^1+i^2+i^3 and add them up

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0you start with 1 because thats what n=

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0You raise it to (n1). So when n = 1, n1 is 0. So the first power is 0. The next power increased by 1, so it's 1.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0nev ermind its fine..can you look at my probability question

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0if you post it on here, someone will be sure to help. there's a lot of people on right now
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