Answer
3.29
Work Step by Step
To find the mean, add the values of each number in the set, then divide the sum by the count of the numbers in the set.
$1.4+2.1+1.6+3.0+1.4+2.2+1.4+9.0+9.0+1.8=32.9$
There are 10 numbers in the list.
$32.9\div10=3.29$