The mass spectrum of an element with two naturally occurring isotopes is shown below. What is the best estimate of the element's (average) atomic weight? 
Definitions:
Budget Constraint
The limitation on the purchasing ability of a consumer based on available income and prices.
Marginal Utilities
The extra pleasure or benefit derived from consuming one more unit of a product or service.
Hard Candies
Sweet confections made by boiling sugar syrup to a high temperature and then cooling it to form solid candies.
Pocket Money
A small amount of money given to children by their parents as an allowance.
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