‘Five hundred households in a middle-class neighborhood were recently surveyed as part of an economic development study conducted by the local government. The data are in the file P4_4.XLS. Identify all of the households in the given data set that satisfy each of the following conditions: 

a. The household owns their home and their monthly home mortgage payment is in the top quartile of the monthly payments for all households.

b. The household’s typical monthly expenditure on utilities is within two standard deviations of the mean monthly expenditure on utilities for all households.

c. The household’s total indebtedness (excluding home mortgage) is less than 10% of the household’s primary annual income level.