40. the median of the following data is 525. find the values of x and y if the sum of the frequencies
is 100.
c. i. frequency
0-100. 2
100-200. 5
200-300. x
300-400. 12
400-500. 17
500-600. 20
600-700. y
700-800. 9
800-900. 7
900-1000. 4