I did these earlier, see
http://www.mathhelpforum.com/math-he...nt-sample.html
but they asked the wrong question for part 3, it's easy to fix it, just use 1.645 instead of -1.645
The parent distribution of x is normal with mean 80 and std. dev. 9
sample size n = 25, mean (pop) of mean (samp) = 80, std dev (pop) of mean (samp) = 9/5 = 1.8
_
x = sample mean
find
A. P(62 < x < 80)
_
B. P(71 < x < 77)
_
C. x' such that P(x > x') = .05
Thanks in advance if anyone can help me with this
I did these earlier, see
http://www.mathhelpforum.com/math-he...nt-sample.html
but they asked the wrong question for part 3, it's easy to fix it, just use 1.645 instead of -1.645