Normal distribution of juice

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Quantity of juice in a pack of 1L is normaly distributed with average (mean) 950ml, and with standard deviation of 10ml.

What is the probability that random pack of juice contains less then 945ml of juice?

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$945$ mL is $5$ mL below the mean. $5$ mL is half of the standard deviation. So the question is, what is the probability that a standard normal random variable is less than $-1/2\ {}$? Usually you'll get that from a table or from software.