assume the random variable x is distributed with a mean of p=87and standard deviation a=5 find the probability P(x<85)
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The answer is 0.2266.
1. Find the z-score for 85. (85-87)/5 = 0.4.
2. Find P(Z < 0.4) = 0.7734.
3. Subtract this from 1.1 - 0.7734 = 0.2266.
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