Amother had a girl named mia when she was 18. four years later, when she was twenty two, she had triplets. then a year later, at 23, she had another child. how old is the mother when the triplets are 12, the single child is 11 and the original child mia is 16?

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?