Answer:
No. of Teenagers in sample = 10
Step-by-step explanation:
Total Number of People visited the zoo = 350
Lets find the Number of Teenagers who visited the zoo.
From the table of cumulative frequency:
Total individuals < 12 years = 90
Total individuals < 19 years = 210
As Teenagers means individuals ranging form 13 to 19 years of old.
Total Teenagers = 210 - 90
Total Teenagers = 120
To find No. of Teenagers in a sample size of 30, we use stratified sampling.
No. of Teenagers in sample = (Total Teenagers / Total People) · Sample size
No. of Teenagers in sample = (120/350) · 30
No. of Teenagers in sample = 10.29
No. of Teenagers in sample = 10 (Round off)
