Answer:
33%
Step-by-step explanation:
2/3=0.6666666667 (0.7 rounded to 1.d.p)
0.6666666667*100=66.66666667% (67% rounded)
To work out 1/3 (the amount of people who don't sleep for less than 8 hours...
Either...
1/3=0.3333333333*100=33.33333333% (33% rounded)
Or...
100% (all people) - 67% (2/3 who sleep less than 8 hours)= 33%