3: four straight lines k l m , and n intersect as shown in
the diagram. lines k and n are perpendicular. find x.
a 23
b 28
c 53
d 55

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?