Suppose a simple random sample of size 64 is obtained from a population with
a mean μ=80 and standard deviation σ=16 . Use this information to find
P(x > 86).
On your TI-84,
press 2ND
press VARS
press 2
Make the screen read:
normalcdf
lower:86
upper:99999999
μ:100
σ:16/√(64) <---the square root key is 2ND x2
Paste
Scroll down with the down arrow to Paste
Press ENTER
Read on the screen
normalcdf(86,99999999,80,100,16/√(64))
Press ENTER
Read 0.0013499672 round to 0.0013
Edwin