The following table shows the number of people that are either 18, 19, 20 or 21 years old, from a sample of 257 people. a) Complete the table. Age Number of people 18 65 19 53 20 76 21    (b Find the mean for this sample. Give your answer to at least 2 decimal places.  (c Find the standard deviation for this sample. Give your answer to at least 2 decimal places.

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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.