Question 1055250
The TI syntax is normalcdf(smaller, larger, µ, σ).
P(30.25 ≤ x ≤ 30.65)= normalcdf(30.25,30.65,30.05,.2)
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Recommend Using stattrek.com to check  Results
until You are familiar with Using Your Calculator.
One could also Use Your Casio fx-115 ES plus 0r fx-991 ES plus.
Myself, generally I use the very inexpensive Casio fx-115 ES plus