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A survey was conducted to assess the effectiveness of the proposed strategy. The data show the average output from 20 samples is 175 units per

A survey was conducted to assess the effectiveness of the proposed strategy. The data show the average output from 20 samples is 175 units per day with a standard deviation of 30 units per day. What is the probability of getting an average of: a. greater than 185 units per day? b. 160 - 180 units per day

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