Question 3 It is known that the household incomes in Perth suburbs follow a normal distribution with a known standard de

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Question 3 It Is Known That The Household Incomes In Perth Suburbs Follow A Normal Distribution With A Known Standard De 1 (20.37 KiB) Viewed 26 times

Question 3 It is known that the household incomes in Perth suburbs follow a normal distribution with a known standard deviation of $3000. A random sample of 10 households was taken as follows 54500, 49600, 52500, 52200, 45300, 53700, 48500, 51200 Estimate the mean annual household incomes of all households in Perth with 95% confidence. B] a rock band promotes is in the process of deciding whether to book a new band for a rock concert. They know this brand appeals almost exclusively to teenagers. The promoter decides to do a survey to try and estimate the proportion of teens who will attend the concert. How large a sample should be taken to estimate the proportion to within 0.3% with 90% confidence.