The mean monthly household electric bill in the United States was $148.76 with standard deviation $20.87. Assume the amounts are normally distributed.

The mean monthly household electric bill in the United States was $148.76 with standard deviation $20.87. Assume the amounts are normally distributed. Between what two amounts are the middle 89% of the electric bills?

The middle 89% of the electric bills are between $ and $ . Round to the nearest cent.

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