Math Chapter Wise Statistics And Probability English MCQ NVS PGT 10-06-2019 Q.The standard deviation of 8 observations 4.8, 4.2, 5.1, 3.8, 4.4, 4.7, 4.1 and 4.5 is: A0.39 B0.37 C0.41 D0.32 Show answer Correct answer: 0.39