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Orange Mobiles claims that the average battery life of their flagship mobile is at least 7 hours. They try to verify this claim on 50
Orange Mobiles claims that the average battery life of their flagship mobile is at least 7 hours. They try to verify this claim on 50 mobiles. They find that the average battery life of these 50 mobiles is 6.5 hours with a standard deviation of 2 hours.
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