I can't seem to get the same answer. What I do is 82,357 + (2.575)(1089.47) which gives me a different answer.
I get 1089.47 from 4,492/sqrt(17)
and 2.575 from
.01 / 2 = .005
1 - .005 = .995
invnorm(.995) = 2.575
can someone explain what I'm doing wrong?