The following data give the total food expenditures (in dollars) for the past one month for a sample of 20 families.
1134
527
1242
573
429
885
1489
684
1267
1181
933
1136
738
1064
936
931
1034
1196
1372
455
a. Calculate the mean and median for these data.
Mean =
Median =
b. Calculate to 2 decimal places the 20% trimmed mean for these data.
20% trimmed mean =
