Recent questions in Average

Ruby Briggs 2022-07-23

The average number of students per class at school $X$ is $25$ and the average number of students per class at school $Y$ is $33$ . Given that there are more classes in school $X$ than in school $Y$ , is the average number of students per class for both schools combined less than $29$ ?

posader86 2022-07-23

From $10$ numbers $a, b, c, . . . j$ all sets of $4$ numbers are chosen and their averages computed. Will the average of these averages be equal to the average of the $10$ numbers?

Noelanijd 2022-07-22

Is a weighted average, assuming the weights sum up to one, always smaller than the unweighted arithmetic average? As if the weights are smaller than one the weighted mean is a convex combination of the individual points. Is there any condition on the individual observation for the statement to hold true?

Nathalie Fields 2022-07-17

Find the find the quadratic average and the geometric average. To do this I have these informations :
The standart deviation, the arithmetic average and the number of values.