Answer: 2.2962419891482
Step-by-step explanation: First get the mean of the numbers or the average
the mean in this case is 86
then subtract each number by the mean of 86
the numbers then become : 3, 2, -2, 1, 3, -2, -2, -3, -1, 3, -2
then square all the numbers to get : 9, 4, 4, 1, 9, 4, -4, 9, 1, 9, 4
then find the mean of those numbers which is 5.2727272727273
then find the square root of this number to find the standard deviation
2.2962419891482 is the standard deviation
hope this helps mark me brainliest if it helped
