Consider this data set. It represents the number of sunny days in Phoenix, Arizona, during several months.

{23,30,24,28,27,24,26}

Click on the link to use the GeoGebra graphing calculator to calculate the standard deviation.

Round to the nearest tenth, if necessary.

Interpret the standard deviation for the data set. Use the drop-down arrows to complete the sentences.

The standard deviation for the number of sunny days is [26, 4.6, 6.9, 2.3]. This means that about 99.7% of the months had within [2.3, 26, 6.9, 4.6] sunny days higher or lower than the mean, which is [4.6, 26, 6.9, 2.3]