Answer:
3.9
Step-by-step explanation:
Mean: 15 + 13 + 9 + 3 + 10 + 5 + 3 + 1 + 7 = 66/9 = 7.3
7.3 - 15 = 7.7
7.3 - 13 = 5.7
7.3 - 9 = 1.7
7.3 - 3 = 4.3
7.3 - 10 = 2.7
7.3 - 5 = 2.3
7.3 - 3 = 4.3
7.3 - 1 = 6.3
7.3 - 7 = 0.3
7.7 + 5.7 + 1.7 + 4.3 + 2.7 + 2.3 + 4.3 + 6.3 + 0.3 = 35.3/9 = 3.9
~hope this helps~
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