If below is the bar graph,

The horizontal axis represents Tammy's activity during the day, and the vertical axis represents the time Tammy spent doing each activity.

The time, Tammy spent at school was about 6.2 hours.

The total angle at the center of a pie chart is 360°

Since a day consists of 24 hours, the angle for School would be about:

\frac{6.2}{24}\times 360^\circ = 93^\circ

#### So, the approximate angle for the time Tammy spent at school is about 90°.

I found an answer from www.scientificamerican.com

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