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Can I have some help with this A random sampling of a company's monthly operating expenses for n = 49 months produced a sample mean

Can I have some help with this
A random sampling of a company's monthly operating expenses for n = 49 months produced a sample mean of $5,131 and a standard deviation of $761. Find a 90% upper confidence bound for the company's mean monthly expenses. (Round your answer to two decimal places.) $ You may need to use the appropriate appendix table or technology to answer this question. Need Help? _

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