In an infantile paralysis epidemic 500 persons contracted the disease. 300 received no serum treatment and of them 75 became paralysed. Of those who received serum treatment 65 became paralysed. Was the serum treatment is effective?
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In an infantile paralysis epidemic 500 persons contracted the disease. 300 received no serum treatment and of them 75 became paralysed. Of those who received serum treatment 65 became paralysed. Was the serum treatment is effective?
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