The mean temperature for January was 30$\degree$F. In February the mean was 25$\degree$F and for March the mean was 35$\degree$F. The weighted mean for these three months is
A) 30$\degree$F
B) greater than 30$\degree$F
C) less than 30$\degree$F.

Question

Quizplus · Accepted Answer

The weighted mean is the average of the means, weighted by the number of days in each month. January has 31 days, February has 28 days, and March has 31 days. So the weighted mean is (30 * 31 + 25 * 28 + 35 * 31) / (31 + 28 + 31) = 30.25$\degree$F, which is greater than 30$\degree$F.

The Mean Temperature for January Was 30 °\degree° F in February the Mean Was 25

The Mean Temperature for January Was 30 $\degree$ F in February the Mean Was 25