the mean is adding all them together and dividing by how many there are
2+3+5+6+1+10 = 27
there are 6 numbers so 27/6 = 4.5
mean = 4.5
26.4 just multiply 6 * 4.4 and that would be the answer!
1 km = 1000 m
So
x km = 3,400 m
that means 3.4 km would be equal to 3,400 m
your final answer is