Amedical researcher estimates the percentage of children who are exposed to lead-base paint, adding that he believes his estimate has a margin of error of about 3%. explain what the margin of error means.

Step-by-step explanation:

Margin of error Percentage: A margin of error tells you how many percentage points your results will differ from the real population value. For example, a 90% confidence interval with a 3 percent margin of error means that your statistic will be within 3 percentage points of the real population value 90% of the time.

< coa = 150 ( given)

as ba and bc are tangents

so oc and oa is perpendicular to cb and ab respectively because in circle normal passes through centre

so in quadrilateral oabc

< coa + < oab + < ocb + < abc = 360

150 +90+90 + < abc = 360

330 + < abc = 360

< abc = 360 -330 = 30

so < abc = 30

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