QUESTION 1 In a phone manufacturing company, the management would like to know the mean defective units per batch. Assume number of defective units follows the normal distribution, for a sample of 20 phones, the mean defective units was 52.38 phones with a standard deviation of 4.34 Find only the Lower Limit of the confidence interval for the value of the population mean with 95% confidence interval. (Write your answer in 2 decimals places)

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