Question 1159959
This has a z-score of (100-120)/10=-2
probability of z< -2 is 0.0228
The probability of z<-2 is 0.02275, I rounded.
Can also do it by 2nd VARS 2 normalcdf (-6, -2). note, the -6 is just far enough to the left to be effectively infinite. You may use 1e99).