I am working on the following problem:
The scores on a Physics test follow a normal distribution with mean $70 \%$ and standard deviation $8 \%$. Calculate the probability of a student to score more than $85 \%$.
Does it make sense to have an upper boundary for a normal distribution? Which one of the following calculations should I do?
TI-nspire CX command: normCDF(lower boundary, upper boundary, mean, stdev)
Option 1: $normCDF(85, 100, 70, 8) = 0.030308$
Option 2: $normCDF(85, 9E999, 70, 8) = 0.030396$
Thank you.