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4 The personnel department of a company found that 80% of the employees want to join a trade union. If a random sample of 100

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4 The personnel department of a company found that 80% of the employees want to join a trade union. If a random sample of 100 employees is drawn, (i) what is the probability that the sample will contain at least 75 who want to join a trade union? , (ii) what is the probability that the sample proportion of employees who want to join the trade union is less than 70%

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