anonymous
  • anonymous
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
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
ok, so first we find the average of the population
anonymous
  • anonymous
is it possible to do this on the calculator?
anonymous
  • anonymous
of course

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anonymous
  • anonymous
is 10.74054817 correct?
anonymous
  • anonymous
no, i got 88,
anonymous
  • anonymous
ill show you why, its long tedious, but simple. bear with me
anonymous
  • anonymous
wait, did you get 10.74054817 for the average?
anonymous
  • anonymous
wait before you do all that can't you put it in the table on the calculator and then hit 1var stats and type in (L1,L2)
anonymous
  • anonymous
well its population standard deviation remember
anonymous
  • anonymous
yes, but you need to find the average of the population first. did you do that?
anonymous
  • anonymous
thats not the way we did it so im not sure how to do that..
anonymous
  • anonymous
find the average? you know. if we have 6,8,4 we find the average by (6+8+4)/3= 6 so the average of this population is 6
anonymous
  • anonymous
ill do this in the calculator can you look at the other two please?
anonymous
  • anonymous
ok

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