Question: Given a normal distribution with = 100 and = 10, what is the probability that a. X > 75? b. X < 70?

Given a normal distribution with μ = 100 and σ = 10, what is the probability that
a. X > 75?
b. X < 70?
c. X < 80 or X >110?
d. Between what two X values (symmetrically distributed around the mean) are 80% of the values?

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