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d) A marketing firm conducted a survey to determine the mean amount people spend at a popular big pot chicken rice shop during a week.

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d) A marketing firm conducted a survey to determine the mean amount people spend at a popular big pot chicken rice shop during a week. They found the amount spent per week followed a normal distribution with a population standard deviation of RM4. A sample of 64 customers revealed that the mean is RM25. What is the 99% confidence interval estimate of u? (7 marks)

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