### Confidence interval for the proportion of customers

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In a mobile phone shop on a Sunday morning, out of n = 77 customers x = 19 buy a mobile phone. What is the 95% confidence interval for the proportion of customers buying a mobile phone?

(1) [0.165, 0.326]

(2) [0.149, 0.342]

(3) [0.228, 0.252]

(4) [0.115, 0.376]

(5) [0.1485, 0.3586]

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