Average of five email messages per day
A statistics professor receives average of five email messages per day from students. Suppose the number of messages approximates a poisson distrivution. What is the probility that on a randomly selected day she will have four messages?
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A statistics professor receives average of five email messages per day from students. Suppose the number of messages approximates a poisson distrivution.
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A population is estimated to have standard deviation of 20. We want to determine the population mean in 5, with 95% level of confidence. How large of sample is needed?
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