Class Frequency Mid-point
13-15 7 13+15/2=20.516-18 4 16+18/2=1719-21 3 19+21/2=2022-24 5 22+24/2=2325-27 7 25+27/2=2628-30 7 28+30/2=29
(16+18)/2 = 17
So, the answer is A (17).
The lank that you are missing is X yet the answer to the problem would be 5.
1. x=7
2. x= -6
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the other 2 i got lazy but need points sorry
25,141,0,1-17,1-25 hope it helps