The table shows transactions from five different bank accounts. a.) What is the missing transaction amount for Account 2?
b.) What is the old account balance for Account 4?
c.) What is the new balance for Account 3?
d.) Explain what each of the numbers -10, -20, and -30 tells you about Account 5

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?