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Please use a normal distribution X with mean =30 and standard deviation = 5 (your example)...

Please use a normal distribution X with mean =30 and standard deviation = 5 (your example) as an example to calculate:

1. P(25<X<35)
2. P(X>50)
3. Find a if (X<a)=0.35

Also, can you think about a reason why the probability in 2. above is useful?
Math   Statistics-And-Probability   
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