Answer:

s: 5.39

Count, N: 7

Sum, Σx: 62

Mean, x̄: 8.85

s2:  29.14

Step-by-step explanation:

s2 =  

Σ(xi - x̄)2

N - 1

=  

(1 - 8.8571428571429)2 + ... + (18 - 8.8571428571429)2

7 - 1

=  

174.85714285714

6

=  29.142857142857

s =  √29.142857142857

=  5.3984124650546