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OpenStudy (anonymous):
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jimthompson5910 (jim_thompson5910):
how far did you get?
jimthompson5910 (jim_thompson5910):
do you remember the curve I drew for the previous problem?
jimthompson5910 (jim_thompson5910):
that's the normal distribution or bell shaped curve
jimthompson5910 (jim_thompson5910):
what's the mean in this case?
jimthompson5910 (jim_thompson5910):
what is 1 standard deviation above the mean?
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jimthompson5910 (jim_thompson5910):
you add that to 64 to get 67.5
jimthompson5910 (jim_thompson5910):
so 67.5 is one std dev above the mean
jimthompson5910 (jim_thompson5910):
what is one std dev below the mean
jimthompson5910 (jim_thompson5910):
that would be 2 std dev above the mean
jimthompson5910 (jim_thompson5910):
because you added 2*3.5 to 64 to get 71
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jimthompson5910 (jim_thompson5910):
that's 1 std dev below the mean
jimthompson5910 (jim_thompson5910):
how about 2 std dev below the mean?
jimthompson5910 (jim_thompson5910):
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