Suppose x is a uniform random variable with a = 10 and b = 90.
X ~ Uniform (a = 10, b = 90)
We want to find, P(13 < x < 85)
P(13 < x < 85) = (85 - 13) / (90 - 10) = 72 / 80 = 0.90
=> P(13 < x < 85) = 0.90
Answer : 0.90
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