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
 

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