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The average salary of 64 employee was 5400 and the sample standard deviation was 280. Find the 90% confidence interval for the population mean salary.

The average salary of 64 employee was 5400 and the sample standard deviation was 280. Find the 90% confidence interval for the population mean salary. Select one: a. 540052.16 b. 540056.33 c. 540054.24 d. 540058.42

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