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About 1407 sharks would be needed to have a margin of error of 0.25
<h3>What is margin of error?</h3>
Margin of error is used to determine by what value there is deviation from the real value. Margin of error (E) is given by:
The 90% confidence level have a z score of 1.645. Hence for E = 0.25, standard deviation = 5.7 feet, hence:
About 1407 sharks would be needed to have a margin of error of 0.25
Find out more on margin of error at: brainly.com/question/10218601