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Use the Central Limit Theorem to nd the probability of the indicated event, assuming that the distribution of the population data is unknown. The amount oftime students spend checking their phones during a lecture period has a mean of 9.5 minutes and standard deviation of 2 minutes. What is the probability that a sample of 30 students will spend an average of at most 10.3 minutes checking their phones during a lecture period? Standard Normal Distribution Table P( X c 10.3) = |:| The mean annual salary of a sample of 325 office managers is $46,450 with a standard deviation of $9,450. Calculate the margin of error and construct the 95% confidence interval for the true population mean annual salary for office managers. We may assume that the sample standard deviation s is an accurate approximation of the population standard deviation o (i.e., s = o), given that the sample size is so large (n > 200). Standard Normal Distribution Table E = Round to the nearest dollar