My mom didn't realize she had left the bathtub running with the plug in. she was in a panic to get my baby sister to the hospital. we didn't discover the overflow until we returned home a few hours later. the surplus water had filled the heating vents. they made gurgling sounds whenever the heat came on.

a.
dirty

b.
extra

c.
cold

d.
noisy

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?