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03 Oct 2024, 04:07
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
(N/A)
Question Stats:
66% (02:14) correct
33% (01:23) wrong based on 3 sessions
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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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09 Feb 2025, 02:46
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OE
For each of the three groups, the sum of the ratings given by the people in the group is equal to the number of people in the group times the average of their ratings. Therefore the sum of the ratings given by the 100 people in the three groups combined is 45(3.8) + 25(4.6) + 30(4.2), or 412, and the average of the 100 ratings is \(\frac{412}{100}\), or 4.12. Terefore, to the nearest 0.1, the correct answer is 4.1.
For each of the three groups, the sum of the ratings given by the people in the group is equal to the number of people in the group times the average of their ratings. Therefore the sum of the ratings given by the 100 people in the three groups combined is 45(3.8) + 25(4.6) + 30(4.2), or 412, and the average of the 100 ratings is \(\frac{412}{100}\), or 4.12. Terefore, to the nearest 0.1, the correct answer is 4.1.
