If the mean of 7, 4, 4 is 5.0 and the mean of 14, 3, 7, 4 is 7.0, the weighted mean i
A) 6.0
B) 21.5
C) 4
D) none of the other alternatives are correct.

Question

Quizplus · Accepted Answer

The weighted mean is calculated by multiplying each value by its corresponding weight, summing these products, and then dividing by the sum of the weights. For the first set (7, 4, 4) with a mean of 5.0, the total is 15 (since 5 * 3 = 15). For the second set (14, 3, 7, 4) with a mean of 7.0, the total is 28 (since 7 * 4 = 28). The combined total is 43, and the total number of values is 7 (3 from the first set and 4 from the second). The weighted mean is 43 / 7, which is approximately 6.14, not exactly matching any of the provided options, hence the correct choice is "none of the other alternatives are correct."

If the Mean of 7, 4, 4 Is 5