How can I set this question up on a TI84 Plus?

The probability that at least 72 students would prefer a boy?

I verified normal distribution, which it verifies to be yes.

Computed the mean and standard deviation.

I set up the problem as P(X is at least 72)

Percentage is 35%= .35

N = 160 randomly selected students

I am attempting to set it up with normalcdf. I have attempted it using normalcdf(71.5, 1e99, (160)(.35), square root (160)(.35)(1-.35))

I keep getting a wrong answer?? Not sure what I am doing wrong?

I also attempted using 72, 71.5 and 72.5 still wrong.