Using a confidence interval, we have that:
a) The range is from 48.8% to 51.2%.
b) Between 125,000 and 131,000 adults are registered organ donors.
<h3>What is a confidence interval?</h3>
A confidence interval is given by the <u>estimate plus/minus the margin of error</u>.
For this problem, we have that:
- The margin of error is of 1.2%.
The bounds of the range are given as follows:
Hence the range is from 48.8% to 51.2%.
<h3>What are the total numbers?</h3>
We have to find <u>48.8% and 51.2% of 255,200,373</u>, hence:
- 0.488 x 255,200,373 = 124,537,782.
- 0.512 x 255,200,373 = 130,662,591.
Rounded to hundredth thousand, between 125,000 and 131,000 adults are registered organ donors.
More can be learned about confidence intervals at brainly.com/question/25890103
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