Find each length below

Ineed to learn how to solve this problem

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

Given δjkl : δxyz, find x. a)10 b)12 c)16 d)20