The amount of water used in a single load by a certain model of washing machine is normally distributed with a mean of 15 gallons and a standard deviation of 3 gallons. What sample size is needed so that the standard deviation for the distribution of sample means is 0.05 gallons? O A. 60 O B. 8 O C. 3,600 O D. 300 O E. 90,000

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