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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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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?

User Joaquim Oliveira
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2 Answers

5 votes
On virtual school, the answer is 0.02275
User Tang
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3 votes
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!
User Somesh Kumar
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9.2k points
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