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7 Round to the nearst 10ths

Asurvey of 45 teens found that they spent an average of 25.6 hours per week in front of a screen (television, computer, tablet, phone, based on the survey’s sample mean, which value could be the population mean? 2.3 hours 27.4 hours 75.3 hours 41.5 hours

Erin bought christmas cards for $2 each to send to her family and friends. which variable is the dependent variable?

Can someone tell me if this is perpendicular? !