structions: Answer ALL questions Write the numerical answers up to 4 decimal places. 1. The warranty for batteries for mobile phones is set at 400 operating hours, with proper changing procedures. A study of 2000 batteries is carried out and three stop operating prior to 400 hours. Do these experimental results support the claim that not less than 0.2 percent of the company's batteries will fail during the warranty period, with proper charging procedures? Test at 0.05 level of significance. (5

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