ANSWER
6.5 calories per minute.
EXPLANATION
To find the calories Shelley burned per minute, divide the total calories burned by the total minutes ran.
Calories burned for a minute
[tex] = \frac{130}{20} [/tex]
This will give us,
[tex] = \frac{13}{2} [/tex]
[tex] = 6.5 \: calories[/tex]
