Answer:
Option d
Step-by-step explanation:
The population of interest talks about the group that was research into or what type of participants, a research wants to draw a conclusion about.
The population of interest in this case study is all children within the ages of 5 and 15. A sample of 160 children were then drawn out from this total population.
-47=97 hopefully this helped u
Answer: 30g
Step-by-step explanation:
In this question (t½) of isotope is 40 days, which means that after 40 days half of the sample would have decayed and half would be left as it is.
After 40 days ( first half life) 240 /2 = 120 g decays and 120 g remains left.
After another 40 days ( two half lives or 80 days) 120 /2 = 60 g decays and 60 g remains left .
after three half lives or 120 days, 60/2 = 30g decay and 30 g of the isotope will be left.