Mathematics (AS & A Level) · Oct / Nov 2017 · Paper 71 · Question 3
9709
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After an election 153 adults, from a random sample of 200 adults, said that they had voted. Using this information, an !% confidence interval for the proportion of all adults who voted in the election was found to be 0.695 to 0.835, both correct to 3 significant figures. Find the value of !, correct to the nearest integer. [4]
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