Average power output

[destinc]

A man runs up 1576 steps in 9minutes 33sec. If the height gain of each step was 0.20m, and the mass of the runner was 70.0kgs, what was average power output during climb?
I used P=W/T & W=FD
W=70kg(1576)0.20=22,064J
P= 22,064J/573s = 38.5 W
answer given is380W
What am I missing?

 

[SammyS]

You used the man's mass. You should have used his weight.

 

[destinc]

so W=70kg(9.81)(.2)(1576)=216447.84
P=216447.84/573= 377.7W
Close but not 380W
Where is the discrepancy?

 

[SammyS]

Significant digits?