Susan work at a t-shirt printing business. of 1,900 t-shirts shipped, 171 are printed improperly. what is the experimental probability that a t-shirt is printed correctly? ?

Let's set up a proportion.

 171       x
   ___

1900    100

171 x 100 = 17100
17100/1900 = 9
100-9 = 91

The correct answer is 91. 

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You can find the area of a rectangle by multiplying the length and height. so multiply 1/2*7/4(which is the simpler version of 1 3/4) and you get 7/8 as your answer.