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rebecca1233
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The average of three numbers is 69. The average of four different numbers is 90. What is the weighted mean of all the numbers together?
79
81
83
84
 one year ago
 one year ago
rebecca1233 Group Title
The average of three numbers is 69. The average of four different numbers is 90. What is the weighted mean of all the numbers together? 79 81 83 84
 one year ago
 one year ago

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kropot72 Group TitleBest ResponseYou've already chosen the best response.1
The sum of the three numbers is 69 * 3 The sum of the four numbers is 90 * 4 The weighted mean is found by adding the above two results and dividing that total by 3 + 4 = 7\[weighted\ mean=\bar{x}=\frac{(69\times 3)+(90\times 4)}{7}=you\ can\ calculate\]
 one year ago

kropot72 Group TitleBest ResponseYou've already chosen the best response.1
Good work! Your answer is correct :)
 one year ago
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