Carol Rogers, a local millionaire, promises to donate $500,000 to the Springfield Humane Society, which the society plans to use to build a new animal hospital. Based on Carol's promise, the society begins work on the hospital. Carol then backs out of her offer.

The kamp family has twins, rob and rachel. both rob and rachel graduated from college 2 years ago, and each is now earning $50,000 per year. rachel works in the retail industry, where the mean salary for executives with less than 5 years' experience is $35,000 with a standard deviation of $8,000. rob is an engineer. the mean salary for engineers with less than 5 years' experience is $60,000 with a standard deviation of $5,000.