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1. mode 4 median 4 mean 6+8+7+4+3+1+4= 33 / 7 = 4.71 is the mean

2 . 45 / 2 =22.5 / 2= 11.25

3. 15-100 =85-8.5= 76.5 100-25 = 75.

4. 7+5=12 __7__ 12

5.10+9 =19 10 / 19= 0.526 x 100 = 52.6