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Consider the following table.

Defects in batch Probability

$20\mathrm{.}21$

$30\mathrm{.}37$

$40\mathrm{.}22$

$50\mathrm{.}10$

$60\mathrm{.}07$

$70\mathrm{.}03$

Find the standard deviation of this variable

Homework Help:

$3$VA$.$ Calculating the mean, variance, and standard deviation of discrete variables $($Links to an external site.$)$Links to an external site. $(4$:$35)$

$3$DG$.$ Variance and Standard Deviation of discrete variables $($Links to an external site.$)$Links to an external site. $($DOCX$)$

Group of answer choices

a$)3\mathrm{.}54$

b$)1\mathrm{.}65$

c$)1\mathrm{.}28$

d$)4\mathrm{.}84444444$