What is the probability that the number of cardinal birds will be U at least once

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What is the probability that the number of cardinal birds will be ≥ U at least once on Christmas day during the 10-year period 2012–2021?


The observers wish to identify a normal range for the number of cardinal birds observed per year. The normal range will be defined as the interval (L, U), where L is the largest integer ≤ 15th percentile and U is the smallest integer ≥ 85th percentile.

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