a) find the probability that a individual distance is greater than 213.40cm. b) find the probability that the mean for 20 randomly selected distances is greater than 197.80cm. c) why can the normal distribution be used in part (b), even though the sample size does not exceed 30?

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.