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Function that computes and draws the area between two user specified values in a user specified normal distribution with a given mean and standard deviation
normarea(lower = -Inf, upper = Inf, m, sig)
the lower value
the upper value
the mean for the population
the standard deviation of the population
# NOT RUN { normarea(70, 130, 100, 15) # Finds and P(70 < X < 130) given X is N(100,15). # }
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