Question

Operating Expenses The cash operating expenses of the regional Bell companies during the first half of 1994 were distributed about a mean of $29.87 per access line per month, with a standard deviation of $2.65. Ameritech Corporation's operating expenses were $28.00 per access line per month. Assuming a normal distribution of operating expenses, estimate the percentage of regional Bell companies whose operating expenses were closer to the mean than those of Ameritech.