GRE Math Numeric Entry Question 69

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Source: 150math

Each of the people in three groups gave a rating of Product X on a scale from 1 through 5. For each of the groups, the table above shows the number of people in the group and the average (arithmetic mean) of their ratings. What is the average of the ratings of the product given by the 100 people in the three groups combined? Give your answer to the nearest 0.1.

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