The length of a text messaging conversation is normally distributed with a mean of 2 minutes and a standard deviation of .5 minutes. What is the probability that a conversation lasts longer than 3 minutes?

0.043351

0.063748

0.02275

0.095424

Question

The length of a text messaging conversation is normally distributed with a mean of 2 minutes and a standard deviation of .5 minutes. What is the probability that a conversation lasts longer than 3 minutes?

 0.043351

 0.063748

 0.02275

 0.095424

amistre64 · Answer

2 + k(.5) = 3  is what we are looking for to determine how many standard deviations (k) we are at to assess the information

amistre64 · Answer

and then of course the tools available for us, calculator or table, would have to be addressed.  Or the empirical rule is a close enough approximation

anonymous · Answer

@ganeshie8