Find the area under the standard normal curve to the left of c. z ＝ −0.94 d. z ＝ −1.30 Electric bills: The U.S. Energy Information Agency reported that the mean monthly household electric bill in the United States in a recent year was $110.14. Assume the amounts are normally distributed with standard deviation $20.00. a. Find the 7th percentile of the bill amounts. b. Find the 62nd percentile of the bill amounts
