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A rule of thumb for normal distributions is the following:

 Approximately 68% of observations are within 1 standard deviation of the mean

Approximately 95% of observations are within 2 standard deviations of the mean

Approximately 99.7% of observations are within 3 standard deviations of the mean

Use the 68-95-99.7 rule to approximate the following percentages:




  1. The percentage of days less than 68.4 degrees.


  1. The percentage of days greater than 72.6 degrees.

Verified Answer :

Answer: The percentage of days less than 68.4 degrees is approximately 68%, and the percentage of days greater than 72.6 degrees is approximately 32%

Step-by-step explanation:

1. For days less than 68.4 degrees, within 1 standard deviation is approximately 68%

2. For days greater than 72.6 degrees, outside 1 standard deviation is approximately 32% (100% - 68%)

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