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I am at work right now. I don't have what I did with me. All i can remember is that I created some sort of graph and tried some formulas in the text. I keep getting the same answers.
I had asked someone here to take a look and they came up with 0.1515 for the first part and 0.8485 for the second.
The xyz company tested a new product and founds its lifetime to be normally distributed, with a mean life of 146 days and a standard deviation of 19.5 days. What is the probability that a product selected at random will last longer than 166 days?
The answer I can up with is 0.3485 is this correct?
Also for the same company what is the probability that the product will last between 154 and 180 days?
The answer I came with is 0.200 is this correct?
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