Wvaries jointly with x, y, and z. what happens to w when x, y, and z are each doubled? w is halved. w is doubled. w is quadrupled. w is multiplied by 8.

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