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Suppose that an accounting firm does a study to determine the time needed to complete one person's tax forms. It randomly surveys 125 people. The sample mean is 23.1 hours. There is a known population standard deviation of 6.2 hours. The population distribution is assumed to be normal. NOTE: If you are using a Student's t-distribution, you may assume that the underlying population is normally distributed. (In general, you must first prove that assumption, though.) Part (a) Find the following. (Enter exact numbers as integers, fractions, or decimals.) (i) X= (ii) 0 = (iii) n= Part (b) In words, define the random variables X and X X is the number of tax forms that an accounting firm completes, and X is the mean number of tax forms that an accounting firm completes. O X is the number of tax forms that an accounting firm completes, and X is the mean number of tax forms that an accounting firm completes. O X is the time needed to complete one person's tax forms, and X is the mean time needed to complete tax forms from a sample of 125 customers. X is the time needed to complete one person's tax forms, and X is the mean time needed to complete tax forms from a sample of 125 customers. Part (c) Which distribution should you use for this problem? (Round your answers to two decimal places.) X - 1 0