The random variable x has a normal distribution with µ = 70 and σ = 10. Find the following probabilities:
a. P(x ≤ 75)
b. P(x ≥ 90)
c. P(60 ≤ x ≤75)
d. P(x > 75)
e. P(x = 75)
f. P(x ≤ 95)
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