Multiple Choice Questions on Consider three students in a class and their marks in the exam were 50 60 and 70 What is the standar........... for NDA Exam Preparation

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Multiple Choice Questions

Consider three students in a class and their marks in the exam were 50 60 and 70 What is the standar...........

Mathematics (NDA) Statistics
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    Consider three students in a class, and their marks in the exam were 50,60 and 70 .What is the standard deviation of this data set?

    8.165

    Correct Answer

    7.568

    Incorrect Answer

    6.158

    Incorrect Answer

    9.256

    Incorrect Answer
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    Explanation:

    Student            xi          xi2

    A                   50           2500

    B                   60           3600

    C                70            4900

    ∑xi   =180

    ∑xi2    =11000

    N=3

    Standard deviation=√(n  ∑xi2   -(∑xi   )2 )/n2

    =√(3×11000 –(180)2  )/32

    =8.165

    By: bhavesh kumar singh
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