If below is the bar graph,

Notice that the number of hours Tammy spent in school is 7.1 hours. Now, if this were in a pie chart we can convert 7.1 to an angle the following way.

A pie chart is of 360^\circ

We know that there are 24 hours in a day,

So, 7.1 hours if represented by a pie chart would be \frac{7.1}{24}\times 360^\circ \approx 106^\circ

Now, if the bar graph showed the time Tammy spent at school as 6.1 hours, then we calculate the angle the same way,

\frac{6.1}{24} \times 360^\circ

I found an answer from www.scientificamerican.com

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I found an answer from www.reddit.com

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Please provide the bar graph, so I can provide a relevant answer.

I found an answer from www.scientificamerican.com

The Bicycle Problem That Nearly Broke Mathematics - Scientific ...

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I found an answer from www.reddit.com

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