Question 17 Suppose the age that children learn to walk is normally distributed with mean 12 months and standard deviation 2.2 month. 32 randomly selected people were asked what age they learned to walk. Round all answers to 4 decimal places where possible. a. What is the distribution of X? X - N( b. What is the distribution of I? & - N( c. What is the probability that one randomly selected person learned to walk when the person was between 11.7 and 12.5 months old? d. For the 32 people, find the probability that the average age that they learned to walk is between 11.7 and 12.5 months old. e. For part d), is the assumption that the distribution is normal necessary? ( No Yes f. Find the IQR for the average first time walking age for groups of 32 people. 01 months 03 months IQR: months Check AnswerProgress saved Question 19 A researcher is interested in finding a 95% confidence interval for the mean number minutes students are concentrating on their professor during a one hour statistics lecture. The study included 95 students who averaged 37.4 minutes concentrating on their professor during the hour lecture. The standard deviation was 10.3 minutes. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a [? v distribution. b. With 95% confidence the population mean minutes of concentration is between and minutes. c. If many groups of 95 randomly selected members are studied, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population mean minutes of concentration and about percent will not contain the true population mean minutes of concentration. Check AnswerQuestion 20 Express the confidence interval 22%