myopenmathtcom ' 0 Question 5 B 0/3 pts '0 20 8 99 (9 Details Suppose that textbook weights are normally distributed. You measure 47 textbooks' weights, and find they have a mean weight of 70 ounces. Assume the population standard deviation is 9.5 ounces. Based on this, construct a 95% confidence interval for the true population mean textbook weight. Round answers to 2 decimal places. Question Help: @ Written Example 8 Message instructor i myopenmathtcom 0 Question 6 a 0/2 pts '0 20 z 99 6) Details In a survey, 12 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $36.8 and standard deviation of $8.7. Estimate how much a typical parent would spend on their child's birthday gift (use a 99% confidence level). Give your answers to 3 decimal places. Express your answer in the format of i :I: E. SCH C] Question Help: Q Written Example 8 Message instructor Submit Question Jump to Answer M E "' lmyopenmathcom ' o ' iii ' iii1 ' . Question7 v l l ' 30/5 pts '0 20 3 99 (D Details The mayor is interested in finding a 90% confidence interval for the mean number of pounds of trash per person per week that is generated in the city. The study included 171 residents whose mean number of pounds of trash generated per person per week was 34.1 pounds and the standard deviation was 7.6 pounds. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a ? a distribution. b. With 90% confidence the population mean number of pounds per person per week is between [:] and [:] pounds. c. If many groups of 171 randomly selected members are studied, then a different confidence interval would be produced from each group. About [3 percent of these confidence intervals will contain the true population mean number of pounds of trash generated per person per week and about C] percent will not contain the true population mean number of pounds of trash generated per person per week. Question Help: [Q Written Example 8 Message instructor Submit Question Jump to Answer Mimi [ .QuestionS v [ B 0/5 pts '0 20 The age of children in kindergarten on the first day of school is uniformly distributed between 4.85 and 5.99 years old. A first time kindergarten child is selected at random. Round answers to 4 decimal places if possible. a. The mean of this distribution is [:] b. The standard deviation is D c. The probability that the the child will be older than 5 years old? [3 d. The probability that the child will be between 5.05 and 5.35 years old is [j e. If such a child is at the 14th percentile, how old is that child? [3 years old. Question Help: El Video 1 El Video 2 [2| Written Example 1 8 Message instructor