a-normal-distribution-has-mean-15-mu-15-and-standard-deviation-4-sigma-4-what-is

Question

A normal distribution has a mean of $mu equals 15$ and a standard deviation of $sigma equals 4$ . What is the probability that $X$ falls between $18$ and $23$ ?

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A normal distribution has a mean of μ=15 \mu = 15 and a standard deviation of σ=4 \sigma = 4 . What is the probability that X X falls between 1818 and 2323?

A normal distribution has a mean of $mu equals 15$ and a standard deviation of $sigma equals 4$ . What is the probability that $X$ falls between $18$ and $23$ ?