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What function do I use with TI Nspire CAS to solve: The distribution of lengths of steel bars produced in a rolling mill is unknown.

What function do I use with TI Nspire CAS to solve: The distribution of lengths of steel bars produced in a rolling mill is unknown. However, the mean is 25.50 feet and the standard deviation is 0.1400 feet. To check the quality of the steel bars, a random sample of 49 n steel bars is selected. Use X to denote the sample mean. The probability that the sample mean X is between 25.48 and 25.52 feet is closest to

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