If the mean of poisson distribution is $16$ , then its S.D. is

16

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4

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10

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15

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Solution

The correct option is C $4$
$S . D = \sqrt{λ}$
Mean $= λ$
Therefore S.D. $= \sqrt{16} = 4$

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= \frac{11}{4}

= \frac{15}{16}

\frac{15}{4}

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$X$	$12$	$4$	$6 + m$	$8$	$10$
$F$	$10$	$15$	$25$	$24$	$16$

Class interval	$4 - 8$	$8 - 12$	$12 - 16$	$16 - 20$
No. of employees	$5$	$10$	$15$	$20$

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