Brainliest will mark Which statement shows the associative property of addition?

13⋅(k⋅5)=(k⋅5)⋅13

13⋅(k⋅5)=(13⋅k)⋅5

13+(k+5)=(13+k)+5

23+6y=6y+23

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?