Help! I need the average years of experience for individuals who answered a survey with separate ranges.

If survey respondents answered that...

24.7% have 1-5 years experience

10.9% have 6-8 years experience

18% have 9-12 years experience

27.6% have 13-18 years experience

16.7% have 19-25 years experience

2.1% have 25 years experience

How do I calculate the total average experience of the group??

Any help is greatly appreciated!

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