For a standard normal distribution, find the approximate value of P (z greater-than-or-equal-to negative 1.25). Use the portion of the standard normal table below to help answer the question.

z
Probability
0.00
0.5000
0.25
0.5987
1.00
0.8413
1.25
0.8944
1.50
0.9332
1.75
0.9599
11%
39%
61%
89%

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