A cognitive psychologist was interested in the ability of men and women to multitask-a cognitive skill thought to engage short-term or working memory. The psychologist observed a sample of 5 men (n = 5) and 8 women (n = 8) and measured the number of tasks they could accurately complete within a short time frame. He found that men completed 2.3 tasks on average (M = 2.3), whereas women completed 4.5 tasks on average (M = 4.5). What is the weighted mean for both samples? The overall mean is not 3.4 tasks.