Given a normal distribution with = 70 and = 20, what is the probability that

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Given a normal distribution with μ = 70 and σ = 20, what is the probability that

a. X > 110.

b. X < 10.

c. X < 70 or X > 130.

d. Between what two X values (symmetrically distributed around the mean) are 70% of the values.

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