Suppose a 12 years old asked you to explain difference between a sample and a population, hot would you explain it to him/her. How might you explain why you would want to take a sample, rather that surveying every member ...
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70 independent messages are sent from an electric tansmission center. Messages are processed sequentialy, one after another. The transmission tome of each message is exponential with a mean of 0.2 minute. Find the probability that all 70 messages are transmitted ...
A homework consist of 40 independent problems is given. On the average, it takes 5 minutes to solve a problem, with a standard deviation or 2 minutes. Find the probability that the homework will be completed in less than 3 ...