UPSKILL MATH PLUS

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The number of children of various age groups playing in the park.
 
Age
\(2 - 4\)
\(4 - 6\)
\(6 - 8\)
\(8 - 10\)
\(10 - 12\)
Number of children
3
5
11
14
19
 
Find its standard deviation  using step deviation method. 
  
Answer:
 
The standard deviation of the data is .