Normalcdf(80.75,infinity,74,4)
If the question is: How do I enter infinity into my calculator?
Just answer a ridiculously large number for infinity, such as 999999,
The answer my calculator gives for normalcdf(80.75, 999999, 74, 4) is 0.04575 (approximately).
normal distribution with mean 74 and std. dev. 4
\(\text{Normalcdf}(80.75,\infty,74,4) = 0,045753624961741\)
