6_She plans to stand outside her Mom's room and measure the sound.
2_She knows she needs her CD player and the loudest CD she likes.
1_Sheryl wonders how loudly she and her friends can play music without disturbing her Mom.
8_Sheryl decides that half volume is still too loud.
5_She plans to turn on the CD player in the rec room with her CD at at half volume.
3 _One day when her Mom isn't sleeping, Sheryl tries the experiment.
4_Sheryl thinks that half volume should be low enough.
7_Standing outside her Mom's room she can still hear the music.