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Mathematics 10 Online
OpenStudy (anonymous):

HELP I WILL FAN AN MEDAL!!!!!!!!!!!! A study of one thousand teens found that the number of hours they spend on social networking sites each week is normally distributed with a mean of 30 hours. The population standard deviation is two hours. What is the 95% confidence interval for the mean? 29.76−30.24 hours 29.88−30 hours 30−30.12 hours 29.88−30.12 hours

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