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8inch Active MP3 Bluetooth Mini Louder Speaker - China Mini Speaker and Mini Bluetooth Speaker price | Made-in-China.com
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![SOLVED: A student exchanges the stock headphones (β1 = 89 dB) for her mp3 player for a new set that is louder (β2 = 92.5 dB). If the first set produced a SOLVED: A student exchanges the stock headphones (β1 = 89 dB) for her mp3 player for a new set that is louder (β2 = 92.5 dB). If the first set produced a](https://cdn.numerade.com/ask_previews/cb767dd8-7a63-4a51-a56c-00ba712b429d_large.jpg)