For the data set 3 7 5 8 4 7 5 9 4 7 6 11 4 7 6 12 4 7 6 16 5 8 7 25 Send data to Excel Part 1 of 4 Your Answer is correct (a) Find the first and third quartiles. The first quartile is 5. The third quartile is 8. Part: 1 / 41 of 4 Parts Complete Part 2 of 4 (b) Find the IQR.

Best answer that i found on yahoo ok   set :   x= length of 2nd piece in cm  x- 3= length of 1st piece in cm  x-4= length of 3rd piece in cm  then since you know they all came from the 20 cm ribbon you add them together and set them equal to 20x+ x-3 +x-4 = 20  3x - 7= 20  3x= 27  x= 9  the shortest piece is the third piece which is x- 4  x-4  9-4 = 5  the length of the smallest piece is 5 cm.  the other lengths are  9 cm  6 cm