The time until the first failure occurred in supplies ink to a particular printer brand, follows a normal distribution with μ=1500 and standard deviation(σ) 20 hours of operation. What percentage of these printers will be damaged before the end of 1000 hours of operation
Z = (X - μ)/σ
The Attempt at a Solution
Ok first of all i found the z score, which is (1000-1500)/20 = -25
this gives me 0 percentage, actually i have the table in front of me and it gives values for minimum z = -3 or something
so, is there anything i can do to find the exact result?