Probability for the normal distirbution
For each of the following, find the probability for the given normal distirbution:
a. P (x > 4) if X - N (5, 5^2)
b. P (x < 2) if X - N (1.5, 3^2)
c. P (8 < X < 12) if X - N (9, 5^2)
d. P (-1 < X < 3) if X - N (1, 4^2)
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