JEE Main 2004 Mathematics question
In a series of observations, half of them equal a and remaining half equal . If the standard deviation of the observations is 2 , then equals
Answer: (3)
Solution
Mean . Variance . So SD , option (3).
In a series of observations, half of them equal a and remaining half equal . If the standard deviation of the observations is 2 , then equals
Mean . Variance . So SD , option (3).