(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

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

2. Relevant equations

Z = (X - μ)/σ

3. 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?

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# Homework Help: Normal distribution and probability

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