Checking accounts are often used for household expenditures. Because they pay no interest, most households including wealthy ones keep a minimum amount in these accounts. a. Estimate the mean total...

Checking accounts are often used for household expenditures. Because they pay no interest, most households including wealthy ones keep a minimum amount in these accounts. a. Estimate the mean total value of checking accounts held by wealthy households (CHECKING). b. Is the required condition satisfied? If not, why not?