Can someone me to find the measure for spt .

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?

Urgent? will give brainliest to the first correct answer what is the area of the figure?

Aiko jumped rope for 20 min and stopped at 8: 05 when did she start