Joylyn is writing an equation to model the proportional relationship between y the total cost in dollars of downloading videos from a website and X the number of videos downloaded she knows that the total cost to download 3 videos was $12 her work to find the equation is shown below where did Joy Lynn make her first error

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?