There are four activities on the critical path. coincidentally, their standard deviations are all equal to 4. the standard deviation of the critical path is therefore equal to:

Element 17 is chlorine it is a group 7 element(halogen) and belongs to period 3 of the periodic table

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.