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S.D(X) = 6 and S.D(Y) = 8. If X and Yare independent random variables, then S.D(XY) is:
To compare the variation of two or more than two series, we use
If the third moment about mean is zero, then the distribution is:
In a symmetrical distribution, Q_{3} – Q_{1} = 20, median = 15. Q_{3} is equal to:
In a mesokurtic or normal distribution, 4 = 243. The standard deviation is:
If all the scores on examination cluster around the mean, the dispersion is said to be:
The range of the scores 29, 3, 143, 27, 99 is:
The ratio of the standard deviation to the arithmetic mean expressed as a percentage is called:
If standard deviation of the values 2, 4, 6, 8 is 2.236, then standard deviation of the values 4, 8,12, 16 is:
If mean=25, median=30 and standard deviation=15, the distribution will be:
In a set of observations the variance is 50. All the observations are increased by 100%. The variance of the increased observations will become:
The first three moments of a distribution about the mean X are 1, 4 and 0. The distribution is:
Bowley's coefficient of skewness lies between:
69 videos90 docs16 tests

69 videos90 docs16 tests
