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Rick is an engineer testing the stress required to break samples of steel. He measured the failure stress of 50 samples and found the mean

Rick is an engineer testing the stress required to break samples of steel. He measured the failure stress of 50 samples and found the mean failure stress to be 350 MPa, with a standard deviation of 25 MPa.

If the distribution is normal, the percentage of the data that lies within two standard deviations of the mean is approximately __________.

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