Let x be a random variable which is distributed normal


Let X be a random variable which is distributed normal with mean 200, but you don't know the standard deviation. Do pairwise comparisons (greater than, equal to, less than or can't say) for the following four quantities:
a. P(100 b. P(280 c. P(120 d. P(x>280)

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Basic Statistics: Let x be a random variable which is distributed normal
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