Can somebody check this one two

#1
If the mean life of an aircraft engine part is 510 hours and the standard deviation is 30 hours, what percentage of parts lasts no more than 462 hours? (Assume a normal distribution for life). (1 marks).

z= (x-mu) /s

so z = (462-510)/ 30

= -1.6

from z table = 44.52

So rounded 45 % of engine parts last no more than 462 hrs