2) Dora is the quality control manager of a candy producing factory. She has measured the weight of 25 boxes of candies. The average of the weights of these 25 boxes is 490, and the standard deviation of them is 11. She is going to provide a label for the weights of boxes with 90% confidence. What is the range of the weights that she should report? (3 marks) 3) Helen is reading a news article that 62% +9% of students ofAcsendaare Asian. What sample size is used in this study? (3 marks) 1 4) Akbar is a manager at Kara Tyres. He suspects that the claim that their tyres can go 45000 km without being worn out is incorrect. He has sampled a group of 85 tyres and calculated that the average kilometers that his sample of tyres can go before being worn out. The average is46800, with the sample standard deviation of 3150 km. Is there evidence that the average kilometers for tyres is more than 45000?Test the hypothesis at 0.025 significance level using the critical value approach