Last year, a Home Appliance Store sold an average (arithmetic mean) of 42 microwave ovens per month. In the first 10 months of this year, the store has sold an average (arithmetic mean) of only 20 microwave ovens per month. What was the average number of microwave ovens sold per month during the entire 22 month period?

• ovens sold last year=12*42=504
  ovens sold this year=10*20=200
  total ovens sold in 22 months=504+200=704
  avg. sales in 22 months = 704/22=32
• 12 years agoHelpfull: Yes(12) No(0)
• total cost of selling ovens=(42*12)+(10*22)=704
  average=total cost/total no of ovens=(704/22)=32
• 12 years agoHelpfull: Yes(3) No(1)