A loan officer knows that 50% of loan applicants in their 20…

A loan officer knows that 50% of loan applicants in their 20s have bad credit, 40% of loan applicants in their 30s have bad credit, and 20% of loan applicants age 40 or more have bad credit.  She also knows that 30% of loan applicants are in their 20s, 50% are in their 30s, and the rest are at least 40 years of age.  What percentage of applicants with bad credit are at least 40 years old?  Show some work or calculator key strokes for full credit.

Frugal Francis re-insulated her home with ACME Insulation. …

Frugal Francis re-insulated her home with ACME Insulation.  She wants toknow if her natural gas consumption decreased. January of last year, she used 682 therms of gas (for an average of 22 therms per day). This past January, after re-insulating, she used an average of 14 therms per day (for 31 days), with a sample standard deviation of 3.8 therms. What do you conclude, based on the p-value?