Todd’s friend olivia is flying her plane at an elevation of 6.3 km. from the ground, todd sees the plane moving directly toward him from the west at a 49° angle of elevation. three minutes later he turns and sees the plane moving away from him to the east at a 65° angle of elevation. how fast is olivia flying in kilometers per hour?

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?