The variance is: 58.0
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1 and 19/20
There is a variance in US block measurements. 15 to 20 blocks per mile in different parts of the country, so..................... 11.82 miles (20 blocks/1 mile) = 236.4 blocks ------------------- 11.82 miles (15 blocks/1 mile) 177.3 blocks ---------------- so, you have that much variance to consider for your answer
4/20 + 15/20 = 19/20
Subtract a negative 1. 19 - (-1) = 20
20 - 19 = 1