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The length of a text messaging conversation is normally distributed with a mean of 2 minutes and a standard deviation of 0.5 minutes. What is the probability that a conversation lasts longer than 3 minutes? 

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roseberline

okay.consider  A as  the length of a text message conversation.
p(a>3)=1-p(b<3-2)/0.5)=1-0.97725= 0.02275.
 hope i help.
good luck!

MacYang

On virtual school, the answer is 0.02275

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