You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you believe the population standard deviation is approximately σ=51.3σ=51.3 dollars. You would like to be 98% confident that your estimate is within 1 dollar(s) of average spending on the birthday parties. How many parents do you have to sample?

Recently, a random sample of 25-34 year olds was asked, "How much do you currently have in savings, not including retirement savings?" The data in the table represent the responses to the survey. Approximate the mean and standard deviation amount of savings. E Click the icon to view the frequency distribution for the amount of savings. The sample mean amount of savings is $ Frequency distribution of amount of savings (Round to the nearest dollar as needed.) The sample standard deviation is S (Round to the nearest dollar as needed.) Frequency Savings $0 $199 $200-$399 $400 $599 $600 $799 $800 $999 $1000-$1199 $1200 $1399 342 86 45 21 10 7 1 Print Done

Time to Complete Final Exam. The time needed to complete a final examination in a particular college course is normally distributed with a mean of 80 minutes and a standard deviation of 10 minutes. Answer the following questions. Assume that 20% of students did not complete the exam. What was the exam duration?

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