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Excel Calculation

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The normal probability for the percentage of students that are older than 50 is 19.35% per the excel calculation. The manual calculation that I calculated was at 25%. The normal probability for the percentage of students that are younger than 40 is 39.80% per the excel calculation. The manual calculation was 44.5%. The normal probability for the percentage of students that are between 41 and 46 is 21.93% per the excel calculation. The manual calculation was 18.5%. The normal probability for the age range of the oldest 10% of the students is 54.71 per the excel calculation. The manual calculation was 54. The manual calculations were only slightly different than the excel calculations. With any manual calculation, there is going to be some difference,
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