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The average marks of 10 students in a class was 60 with a standard deviation of 4, while the average marks of other ten students was 40 with a standard deviation of 6. If all the 20 students are taken together and σ is the combined standard deviation, then the value of [σ] is ([⋅] represents the greatest integer function)

Answer» The average marks of 10 students in a class was 60 with a standard deviation of 4, while the average marks of other ten students was 40 with a standard deviation of 6. If all the 20 students are taken together and σ is the combined standard deviation, then the value of [σ] is
([] represents the greatest integer function)


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