Three printing companies were rated on their performance using a percentage scale. This graph shows how they were
rated
Printing Company Ratings
KEY
Q = Quicky Printing Company
R = Reliable Printers, Inc.
S = Superior Printing, Inc
Rating Scale (%)
88 898
Printing Company
Which company was rated the best?

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?