Question 1137718
z=(x-mean)/sd
(1000-1252)/129=-1.95
(1500-1252)/129=+1.92
That z value range has probability of 0.9470

fewer than 1050 is a z<(-202/129)=-1.57
This probability is 0.0582

>1225 is a z>(27/129) or 0.4168

1425 is a z value of (173/129) or 1.34
The probability of less than that is 0.9099 or 91st percentile.