A regression was run to determine if there is a relationship between hours of TV watched per day (x) and number of sit-ups a person can do (y). The results of the regression were:

y=ax+b

a=-0.955

b=24.209

r²=0.408321

r=-0.639

Use the results above to predict the number of sit-ups a person who watches 1 hour of TV can do? ___________ (to one decimal place)