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The cash operating expenses of the regional phone companies during the first half of 1994 were distributed about a mean of $29.97 per access line
The cash operating expenses of the regional phone companies during the first half of 1994 were distributed about a mean of $29.97 per access line per month, with a standard deviation of $2.75. Company N's operating expenses were $36.96 per access line per month in the first half of 1994. Estimate the percentage of regional phone companies whose operating expenses were higher than those of Company N.
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