Question: Based on daily summaries from a Calgary observatory (for January to November 2000), the mean daily counting rates for cosmic rays are approximately normally distributed,

Based on daily summaries from a Calgary observatory (for January to November 2000), 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. If one day is randomly selected, what is the probability that the day's observed mean counting rate is at least 3248?

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