Question

This exercise uses the normal probability density function and requires the use of either technology or...

This exercise uses the normal probability density function and requires the use of either technology or a table of values of the standard normal distribution.

The cash operating expenses of the regional phone companies during the first half of 1994 were distributed about a mean of $29.29 per access line per month, with a standard deviation of $2.85. Company N's operating expenses were $35.10 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. (Round your answer to two decimal places.)
%

Math   Statistics-And-Probability   
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Answer #1

The following information has been provided:

We need to compute . The corresponding z-value needed to be computed is:

Therefore, we get that

The following is obtained graphically:

Please let me know in comments if anything is not clear. Will reply ASAP. Please do upvote if satisfied!!

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