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Hi! Need help with this question. Please try to explain pedagogically as I have some trouble with this. Thanks in advance! A random variable X

Hi! Need help with this question. Please try to explain pedagogically as I have some trouble with this. Thanks in advance!

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A random variable X has expected value g 2 40 and standard deviation (IX 2 25. Consider the independent random variables X1, X 2, X 3, X54 all having the expected value 40 and standard deviation 25 (Remark: They are a random sample of size n = 64- of the r.v. X.) _ X +X +X +... X Find the probability P(35 <_: x g where>

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