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在平时的教学中,笔者发现,同学们对频率和概率这两个概念容易混淆.下面通过几个题目来辨析对这两个概念的理解.例1某水产试验厂实行某种鱼的人工孵化,10000个鱼卵能孵出8513尾鱼苗,根据概率的统计定义解答下列问题:(1)求这种鱼卵的孵化率;(2)30000个鱼卵大约能孵化多少尾鱼苗?(3)要孵出5000尾鱼苗,大概得备多少鱼卵?(精确到百位)分析此题的第(1)小问求孵化率其实就是用一次实验中的孵化频率来估算这种鱼
In the usual teaching, I found that students are confused about the two concepts of frequency and probability.Following the following several questions to discern the understanding of these two concepts.Example 1 Some aquatic pilot plant implementation of a fish artificial hatching, 10000 fish eggs can hatch 8513 fish fry, according to the statistical definition of probability to answer the following questions: (1) to find the hatching rate of fish eggs; (2) 30000 fish eggs can hatch about how many fry? (3) to hatch 5000 fish fry, probably how many eggs? (Accurate to a hundred) Analysis of the problem (1) Small hatching rate is actually used in an experiment to estimate the frequency of hatching fish