7 Use the graph to answer the following questions,
175
150
(4.150)
125
Total Cost
100
(2.100)
75
50 (0.50)
25
1
3
Days
Part A: In the context of the graph, tell the y-intercept and the meaning.

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?