Chemistry, 12.09.2021 04:50 JanaMiqdad7702
A collection of pennies was investigated. 10.00% were found to have been minted in San Francisco with an average mass of 2.15 g and 90.00% we’re minted in in Philly with an average mass of 2.156 g. What was the average mass of pennies in this sample? Give the correct answer with the proper amount of significant figures
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