Atree is supported by a wire anchored in the ground 5 feet from its base. the wire is 1 foot longer than the height that it reaches on the tree. find the length of the wire

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?