26 cm If ABCD is a parallelogram then what is its perimeter?
D
15 cm
A
B
31 cm
82 cm
41 cm
78 cm

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?