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JEE Main & Advanced JEE Main Solved Paper-2017

  • question_answer
    A box contains 15 green and 10 yellow balls. If  10 balls are randomly drawn, one-by-one, with replacement, then the variance of the number of green balls drawn is :-      JEE Main Solved Paper-2017

    A)  \[\frac{6}{25}\]                               

    B)  \[\frac{12}{5}\]

    C)  6                                            

    D)  4

    Correct Answer: B

    Solution :

     We can apply binomial probability distribution Variance = npq                                 \[=10\times \frac{3}{5}\times \frac{2}{5}=\frac{12}{5}\]


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