Answer
The weighted mean is 118.8
Work Step by Step
The weighted mean is the average of all the numbers in a set of numbers. If a number occurs multiple times it is counted that many times in the average.
Sum the frequencies to find the total number of items in the set.
$f=6+14+21+13+22+6+9=91$
Sum all the test scores and divide by the frequency count to find the weighted mean.
$m=((104\times6)+(112\times14)+(115\times21)+(119\times13)+(123\times22)+(127\times6)+(132\times9))\div91$
=$(624+1568+2415+1547+2706+762+1188)\div91$
=$10810\div91$
=$118.8$
