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拜託高手高手高高手救救一個可憐的暑修生....

我必須上台講解題型給同學聽
麻煩大大幫個忙 幫我翻譯一下題型 還有教教我如何講解跟解題 ><

The breaking point of a particular thread is known to be normally distributed with a mean and standard deviation of 0.30 and 0.02 foot pounds,respectively.

The manufacturer wishes to state that 90% of the threads have a breaking point of at least Y foot pounds.

What should the value of Y be?

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