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(それぞれの階級の個数)÷(全体の個数)で出ると思います!
70-80 : 3÷50=0.06
80-90 : 6÷50=0.12
90-100: 15÷50=0.3
100-110: 14÷50=0.28
110-120: 7÷50=0.14
120-130: 5÷50=0.1

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