Question: tough and tricky questions : word problems . a salesman ' s income consists of commission and base salary . his weekly income totals over the past 5 weeks have been $ 406 , $ 413 , $ 420 , $ 436 and $ 395 . what must his average ( arithmetic mean ) income over the next two weeks be to decrease his average weekly income to $ 400 over the 7 - week period ?
A) $ 350
B) $ 400
C) $ 365
D) $ 385
E) $ 375
Correct answer: C
Grade: 6 | Topic: Statistics and Probability | Difficulty: Medium | Standard: 6.SP.A.3