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My question is related to find a probability when we have a normal distribution, the mean and the standard deviation.

I know we have to calculate z but i don t know how to proceed when the probability we are looking for is for something included between 2 numbers.

lets say I have a mean of 100 and a stdrd deviation of 15 and I want to calculate the probability of something that is included between 110 and 120. how can I do this?

Thank you