2-Final Exam Time left 1:43:31 The average salary of 81 random employees in a certain financial sector was 3400 USD. From past information, we can assume that the standard deviation of the population is 270 USD. We are interested in the 90% confidence interval for the population mean. What is the value of the standard error? Select one: O a. 50 O b. 30 O c. 40 O d. 60 8. You are given the following frequency distribution. Class Frequency ut of A 15 20 hp

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