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☐ A
(Choose 1 answer)
(See picture)
A. 2.0
☐ C
B. 3.0
Suppose that contamination particle size X (in micrometers)
can be modeled as continuous random variable with
probability density function f(x) = 3/x4 for x> 1. Determine
the mean of X.
☐ D
C. 2.5
D. 1.5
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