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√7の値が与えられてないとできないと思います。
√(0.3×0.7÷300)
=√((3×7)/(3×10×10×10×10))
=1/100×√(3×7/3)
=1/100×√7
=2.65÷100
=0.0265

1.96×0.0265=0.0519
0.3+0.0519≒0.35
0.3-0.0519≒0.25

お茶さん

ありがとうございます😭

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