Given the sample table below:
Total number of teenagers that get less than 8 hours of sleep each school night
Sample #1:
The number of teenagers that get less than 8 hours of sleep each night include the sum of teenagers that get less than 4 hours, teenagers that get between 4 and 6 hours, teenagers that get between 6 and 8 hours.
Thus, we have
[tex]2+9+39=50\text{ t}eenagers[/tex]
Sample #2:
Thus, we have
[tex]1+12+34=47\text{ te}enagers[/tex]
Percentage of teenagers that get between 4 and 10 hours of sleep each school night
ample #1:
The total number of teenagers that get between 4 and 10 hours of sleep is evaluated to be
[tex]9+39+44=92\text{ te}enagers[/tex]
Thus, the percentage becomes
[tex]\frac{92}{100}\times100\text{ = 90\%}[/tex]
Sample #2:
[tex]12+34+48=94\text{ te}enagers[/tex]
[tex]\frac{94}{100}\times100=94\text{ \%}[/tex]
Hence, based on the result of the survey,
About half of the teenagers get less than 8 hours of sleep each school night,
More than 90% of teenagers get between 4 and 10 hours of sleep each school night.
