The following table shows the number of people that are either 18, 19, 20 or 21 years old, from a sample of 273 people.

a) Complete the table.

Age Number of people
18 79
19 55
20 78
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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