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22-03-2017
Mathematics

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The length of a social media interaction is normally distributed with a mean of 3 minutes and a standard deviation of 0.4 minutes. What is the probability that an interaction lasts longer than 4 minutes?

Respuesta :

22-03-2017

z = (4 - 3)/.4
z = 1/.4
z = 2.5
.0062

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