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The average age of a vehicle registered in the United States is 8 years (96 months)....
suppose the average age for registered voters is mu = 39.60 years with sigma = 11.60...
suppose the average age for registered voters is mu = 39.60 years with sigma = 11.60 years, and that the distribution of ages is normal. During a recent jury trial, a statistician noticed that the average age of the 12 jurors was 50.34 years, a) how likely is it to obtain a jury this old or older by chance? b)is it reasonable to conclude that this jury is not a random sample of registered voters? explain your answer. (a yes...
Suppose the age that children learn to walk is normally distributed with mean 11 months and...
Suppose the age that children learn to walk is normally distributed with mean 11 months and standard deviation 1.5 month. 11 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-NG b. What is the distribution of ? - N c. What is the probability that one randomly selected person learned to walk when the person was between 10 and 12 months...
Suppose that the age that children learn to walk is normally distributed with mean 12 months...
Suppose that the age that children learn to walk is normally distributed with mean 12 months and standard deviation 1 month. 19 randomly selected people were asked what age they learned to walk. Round all answers to two decimal places. A. N 12 B. For the 19 people, find the probability that the average age that they learned to walk is between 11.5 and 12.5 months old C. What is the probability that one randomly selected person learned to walk...
Suppose the age that children learn to walk is normally distributed with mean 11 months and...
Suppose the age that children learn to walk is normally distributed with mean 11 months and standard deviation 2.1 month. 33 randomly selected people were asked what age they learned to walk. Round all answers to 4 decimal places where possible. What is the distribution of X ? X ~ N) What is the distribution of ¯ x ? ¯ x ~ N( ) What is the probability that one randomly selected person learned to walk when the person was...
Suppose the age that children learn to walk is normally distributed with mean 11 months and...
Suppose the age that children learn to walk is normally distributed with mean 11 months and standard deviation 1.3 month. 16 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-NO b. What is the distribution of ? -NG c. What is the probability that one randomly selected person learned to walk when the person was between 10 and 12 months old?...
Researchers report that children between the ages of 2 and 5 years watch an average of...
Researchers report that children between the ages of 2 and 5 years watch an average of 25 hours of television per week. Assume that the variable time is distributed normally with a standard deviation of 2 hours. A random sample of 40 children between the ages of 2 and 5 was chosen. What is the probability that the average time of the selected group of 40 children between the ages of 2 and 5 watch more than 25.5 hours of...
Ages of Proofreaders At a large publishing company, the mean age of proofreaders is 36.2 years...
Ages of Proofreaders At a large publishing company, the mean age of proofreaders is 36.2 years and the standard deviation is 3.7 years. Assume the variable is normally distributed. a. What percentage of the company's proofreaders are between 36 and 37.5 years old? b. If a random sample of 15 proofreaders is selected, find the probability that the mean age of the proofreaders in the sample will be between 36 and 37.5 years.
Mayr et al. (1994) took an SRS of 240 children who visited their pediatric outpatient clinic. They found the following frequency distribution for the age (in months) of free (unassisted) walking amon...
Mayr et al. (1994) took an SRS of 240 children who visited their pediatric outpatient clinic. They found the following frequency distribution for the age (in months) of free (unassisted) walking among the children: 11 9 10 12 13 14 15 16 17 18 19 20 Age (months) Number of Children 13 35 4469 36 24 7 3251 64 Chapter 2: Simple Probability Samples Construct a histogram of the distribution of age at walking. Is the shape normally distributed? Do...
We assume that the ages of university students are normally distributed. The average age of UAGM...
We assume that the ages of university students are normally distributed. The average age of UAGM students is 26 years with a standard deviation of 3 years. A student is selected at random. What is the probability that you are under 23? What is the probability that you are over 32 years old? What is the probability that he is between 23 and 32 years old?
ne average age of doctors in a certain hospital is 43,0 years old. Suppose the distribution...
ne average age of doctors in a certain hospital is 43,0 years old. Suppose the distribution of ages s normal and has a standard deviation of 8.0 years. If 25 doctors are chosen at random for a committee, find the probability that the average age of those doctors is less than 43.8 years. Assume that the variable is normally distributed [6 marks) 14. A mandatory competency test for high school students has a normal distribution with a mean of 400...
Suppose the age that children learn to walk is normally distributed with mean 11 months and standard deviation 1.5 month. 11 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-NG b. What is the distribution of ? - N c. What is the probability that one randomly selected person learned to walk when the person was between 10 and 12 months...
Suppose that the age that children learn to walk is normally distributed with mean 12 months and standard deviation 1 month. 19 randomly selected people were asked what age they learned to walk. Round all answers to two decimal places. A. N 12 B. For the 19 people, find the probability that the average age that they learned to walk is between 11.5 and 12.5 months old C. What is the probability that one randomly selected person learned to walk...
Suppose the age that children learn to walk is normally distributed with mean 11 months and standard deviation 1.3 month. 16 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-NO b. What is the distribution of ? -NG c. What is the probability that one randomly selected person learned to walk when the person was between 10 and 12 months old?...
Researchers report that children between the ages of 2 and 5 years watch an average of 25 hours of television per week. Assume that the variable time is distributed normally with a standard deviation of 2 hours. A random sample of 40 children between the ages of 2 and 5 was chosen. What is the probability that the average time of the selected group of 40 children between the ages of 2 and 5 watch more than 25.5 hours of...
Ages of Proofreaders At a large publishing company, the mean age of proofreaders is 36.2 years and the standard deviation is 3.7 years. Assume the variable is normally distributed. a. What percentage of the company's proofreaders are between 36 and 37.5 years old? b. If a random sample of 15 proofreaders is selected, find the probability that the mean age of the proofreaders in the sample will be between 36 and 37.5 years.
Mayr et al. (1994) took an SRS of 240 children who visited their pediatric outpatient clinic. They found the following frequency distribution for the age (in months) of free (unassisted) walking among the children: 11 9 10 12 13 14 15 16 17 18 19 20 Age (months) Number of Children 13 35 4469 36 24 7 3251 64 Chapter 2: Simple Probability Samples Construct a histogram of the distribution of age at walking. Is the shape normally distributed? Do...
ne average age of doctors in a certain hospital is 43,0 years old. Suppose the distribution of ages s normal and has a standard deviation of 8.0 years. If 25 doctors are chosen at random for a committee, find the probability that the average age of those doctors is less than 43.8 years. Assume that the variable is normally distributed [6 marks) 14. A mandatory competency test for high school students has a normal distribution with a mean of 400...
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