The precipitation,in millimetres,for August is given for 20 different Canadian cities. 113 67 56 43 27
93 58 147 72 58
86 74 39 25 36
103 50 37 36 82

A) 67
B) 56
C) 58
D) 65
E) 36

The question does not specify any context or criteria for determining "the best choice." However, we can assume that the question is asking for a value that is somehow significant or representative of the given data set. One common measure of central tendency for a data set is the mean, or average, which can be computed by adding up all the values and dividing by the total number of values.

For these 20 cities, we can compute the mean precipitation as follows:
(113 + 67 + 56 + 43 + 27 + 93 + 58 + 147 + 72 + 58 + 86 + 74 + 39 + 25 + 36 + 103 + 50 + 37 + 36 + 82) / 20 = 70.1

Therefore, the mean precipitation for these cities is approximately 70.1 mm. Based on this calculation, we can see that choice C) 58 is fairly close to the mean and may be a reasonable choice. However, it's worth noting that the specific choice of "the best" value will depend on the context and purpose of the analysis.