Question's in attachment

3+4+2+1 = 10

                 6

1.6

Step-by-step explanation:

i got 2.5 with the exes

but i got mean=6 with doing 4,5,6 and 9 and the median of those is 5.5 which is an answer choice on the paper

im pretty sure its 2.5 because that is with the data given but i dont see it as an answer choice thats why i told you the other answer  

Step-by-step explanation:to get the mean you get the sum of the numbers divided by the count  the sum in this particular example was 10 and the count 4 because of the rows so 10/4=2.5

x = 3 ± √(5+y)