Tom wants to know the average number of musical instruments students in his school play. He used the school's two band classes, consisting of a total of 48 students, as his representative sample. He concluded that students in his school play an average of three musical instruments.
Is his conclusion valid? (1 point)
• No, because his representative sample is too large.
• No, because he did not choose students randomly.
• Yes, because all members of the sample play at least one musical instrument.
• Yes, because the sample includes both males and females who play musical instruments.