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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]