Mrs. gibbs goes to the store to buy aa and 9v batteries. the store has 12 aa batteries and 15 9v batteries in stock. mrs. gibbs needs at least 6 aa batteries. in all, she wants to buy at least 20 batteries.
mrs. gibbs buys 7 aa batteries.
how many 9v batteries could she buy?
select all that apply.
11
12
13
14
15

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?