Question: Based on daily summaries from a Calgary observatory over a period of ten months, the mean daily counting rates for cosmic rays are approximately normally

Based on daily summaries from a Calgary observatory over a period of ten months, the mean daily counting rates for cosmic rays are approximately normally distributed, with a mean equal to 3465.5 and a standard deviation of 127.7. Find the sixth decile D6. What is the mean daily counting rate that separates the lowest 60% from the highest 40%?

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