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The random variable x has a normal distribution with µ = 75 and σ = 10. Find the following probabilities

a) P(x ≤ 80)

b) P(x ≥  85)

c) P( 70 ≤ x ≤ 75)

d) P(x > 80)

e) P(x = 78)

d) P(x ≤ 110)