Question 1159065
You can use z=(x-mean)/sd which is -10/7 z for 40 and 15/7 for 65.
You can then use normalcdf (-6,15/7) and subtract normalcdf (-6, -10/7)
or easier normalcdf (40,65,50,7) and you get 0.9074

Draw a normal curve, and put 0 at the middle. Go out 3 sd s on both sides.
label the middle 50, and +1 sd is 57, +2 sd 64 and +3 sd 71
on the left -1sd is 43, -2 sd is 36 and -3 sd is 29
Shade the area between 40 and 65 and you will have an idea that it is almost all the normal curve (9/10)