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The historical returns for two investments A and B are summarized in the following table for the period $2016$ to $2020,.$ Use the data to answer the questions that follow.

A

Year Rate of Return

$201622\mathrm{.}4\%12\mathrm{.}7\%$

$20174\mathrm{.}6\%14\mathrm{.}9\%$

$201814\mathrm{.}7\%18\mathrm{.}0\%$

$201929\mathrm{.}3\%19\mathrm{.}0\%$

$202014\mathrm{.}5\%20\mathrm{.}9\%$

Average $17\mathrm{.}1\%17\mathrm{.}1\%$

a$.$

The riskier investment appears to be investment$$ A$,$ with returns that vary widely from the average relative to investment$$ B$,$ whose returns show less deviation from relative to investment$$ A$,$ whose returns show less deviation from the average.

b$.$ The standard deviation for investment A is $9\mathrm{.}30\%$

c$.$ The standard deviation for investment B is$......\%.($Round to two decimal$$ places.$)$

$$