Kareem wants to find the number of hours the average sixth-grader at his school practices an instrument each week. Which is the best way Kareem can get a representative sample?

Kareem wants to estimate practice time for all sixth-graders at his school, so his sample should come from that group. Randomly choosing 50 sixth-graders gives different students a fair chance of being included. The other choices focus on boys, band members, or neighborhood friends, so they may not represent all sixth-graders.

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