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the answer highlighted in blue is incorrect. A manufacturer found that the crack pressure of their football helmets is normally distributed with a mean of

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A manufacturer found that the crack pressure of their football helmets is normally distributed with a mean of 150 lbs. and a standard deviation of 11 lbs. If 28 helmets were randomly selected to be tested, find the probability that the crack pressures have a mean that is less than 145 lbs. 0.0451 0.0081 0.3247 0.0051

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