A random sample of 30 males between ages 25 – 40 is taken for a health and fitness study. Following are their wieghts in kilograms: 75, 72, 83, 76, 65, 88, 67, 76, 78, 89, 86, 74, 78, 89, 88, 78, 77, 83, 84, 69, 72, 74, 78, 75, 61, 86, 85, 84, 81, 79 It was also asked of them if they exercise daily, and only 13 of them answered yes. Based on the above sample data: (a) What can you conclude about the average weight of males aged 25 – 40 years at 90% confidence level? (b) What is the interval for average weight of this population if you want to make a claim at 98% confidence level? (c) What is the proportion of this population that exercises daily? Give a 95% confidence interval.

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