Mean and Std Dev Ratio (Jee Mains) | ExamDuo
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Random Variables and Distributions
Medium
Mean and Std Dev Ratio
A bag contains 30 white balls and 10 red balls. 16balls are drawn one by one randomly from the bagwith replacement. If X be the number of white ballsdrawn, the
(
mean
of
X
standard
deviation
of
X
)
is equal to :
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SELECT ONE OPTION
A
4
B
4
√
3
3
C
4
√
3
D
3
√
2
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