ok thank you. I got it.
the keyword is above the mean.
the value of k before the last 10% of each side(20%). so 80% is in between the 20%
is how I interpreted it as it is.
correct?
'at most' 10%.
why take the other remaining 80%?
it asked for 'at most' 10%.
doesn't this mean anything not greater than 10%?
if it asked 'at least' 10% then anything greater than 10%
the test scores for a large statistics class have an unknown distribution with a mean of 70 and a standard deviation of 10
find k so that at most 10% of the scores are more than k standard deviations above the mean.
I'm a bit confused by the question it self.
does the question means :
1-1/k^2...