Statistics and Probability: JEE Main 2018 Mathematics question

JEE Main 2018 · 16 Apr, Morning shift · Q5438

JEE Main 201816 Apr, Morning shiftMathematicsMediumStatistics and Probability258× since 2002

The mean and the standard deviation(s.d.) of five observations are9 and 0, respectively. If one of the observations is changed such that the mean of the new set of five observations becomes 10, then their s.d. is :