Thank you for reporting, we will resolve it shortly
Q.
If the standard deviation of $3$, $8$, $6$, $10$, $12$, $9$, $11$, $10$, $12$, $7$ is $2.71$, then the standard deviation of $30$, $80$, $60$, $100$, $120$, $90$, $110$, $100$, $120$, $70$ is
We know that, the standard deviation is dependent on scale. If the values in the sample are multiplied by $k$, then the standard deviation will be multiplied by $k$.
So, in given series/sample, multiplied by 10 , then the resulting standard deviation is
$=10 \times 2.71=27.1$