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Given a normal distribution with (mean) μ= 50 and (standard deviation) σ = 5, what is...

Given a normal distribution with (mean) μ= 50 and (standard deviation) σ = 5, what is the probability that:

a) X>60

b) X<40

c) X<45 or X>65

d) Between what two values (symmetrically distributed around the mean) are ninety percent of the values?

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