Answer
a. a. Total amount spent per month by all 2000 shoppers in both age groups = 301400 dollars
b. Mean number of shopping trips per person per month = 9.35 trips
c. Mean amount spent per person per month by shoppers aged 12 to 17 years = 150.7 dollars
Work Step by Step
a. Total amount spent per month by all 2000 shoppers in both age groups
$=(1100*8*14)dollars + (900*11*18) dollars $
$= (123200+178200) dollars$
$= 301400 dollars$
b. Mean number of shopping trips per person per month
$= ((8*1100 )+(11*900))/2000$
$= 18700 / 2000$
= 9.35 trips
c. Mean amount spent per person per month by shoppers aged 12 to 17 years = Total amount spent per month by all 2000 shoppers in both age groups /2000
= 301400 dollars/2000
= 150.7 dollars
