Side 10cm and semicircles
find the area of the shaded design in figure, where abcd is a square of side 10cm a
drawn with each side of the square as diameter. (use t = 3.14).
10cm

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?