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The lengths of adult males' hands are normally distributed with mean 189 mm and standard deviation...
Suppose that the walking step lengths of adult males are normally distributed with a mean of...
Suppose that the walking step lengths of adult males are normally distributed with a mean of 2.4 feet and a standard deviation of 0.3 feet. A sample of 34 men’s step lengths is taken. (a) Find the probability that an individual man’s step length is less than 2.1 feet. (b) Find the probability that the mean of the sample taken is less than 2.1 feet.
3. The average number of miles (in thousands) that a car's tire will function before needing...
3. The average number of miles (in thousands) that a car's tire will function before needing replacement is 72 and the standard deviation is 12. Suppose that 8 randomly selected tires are tested. Round all answers to 4 decimal places where possible and assume a normal distribution. What is the distribution of X? X ~ N( , ) ______ What is the distribution of x¯? x¯ ~ N( , ) ______ If a randomly selected individual tire is tested, find...
The amount of coffee that people drink per day is normally distributed with a mean of...
The amount of coffee that people drink per day is normally distributed with a mean of 15 ounces and a standard deviation of 6 ounces. 13 randomly selected people are surveyed. Round all answers to 4 decimal places where possible. a. What is the distribution of X? X-N b. What is the distribution of m?T-NG c. What is the probability that one randomly selected person drinks between 14 and 16 ounces of coffee per day? d. For the 13 people,...
Suppose that the average number of Facebook friends users have is normally distributed with a mean...
Suppose that the average number of Facebook friends users have is normally distributed with a mean of 136 and a standard deviation of about 44. Assume eight individuals are randomly chosen. Answer the following questions. Round all answers to 4 decimal places where possible. What is the distribution of ¯x? ¯x ~ N For the group of 8, find the probability that the average number of friends is less than 143 Find the first quartile for the average number of...
According to a recent study, the carapace length for adult males of a certain species of...
According to a recent study, the carapace length for adult males of a certain species of tarantula are normally distributed with a mean of 18.66 mm and a standard deviation of 1.55 mm. Determine and interpret the quartiles for the carapace length of these tarantulas. The first quartile is nothing. (Type an integer or decimal rounded to two decimal places as needed.) Interpret the first quartile. Select the correct choice below and fill in the answer box(es) to complete your...
According to a recent study, the carapace length for adult males of a certain species of...
According to a recent study, the carapace length for adult males of a certain species of tarantula are normally distributed with a mean of 18.66 mm and a standard deviation of 1.55 mm. The second quartile is nothing. (Type an integer or decimal rounded to two decimal places as needed.) Interpret the second quartile. Select the correct choice below and fill in the answer box(es) to complete your choice. (Type integers or decimals rounded to two decimal places as needed.)...
Suppose that the average number of Facebook friends users have is normally distributed with a mean of 143 and a standard...
Suppose that the average number of Facebook friends users have is normally distributed with a mean of 143 and a standard deviation of about 49. Assume forty-eight individuals are randomly chosen. Answer the following questions. Round all answers to 4 decimal places where possible. What is the distribution of ¯ x ? ¯ x ~ N( , ) For the group of 48, find the probability that the average number of friends is less than 146. Find the third quartile...
The cholesterol levels of adult males are approximately normally distributed with a mean of 224 mg/dl,...
The cholesterol levels of adult males are approximately normally distributed with a mean of 224 mg/dl, and a variance, o', of 521. Some researchers claim that the variance of cholesterol levels of adult males is less than 521. A sample of 15 adult males' blood tests had a mean of 222.5 mg/dL and a variance of 192. Is there enough evidence to conclude, at the 0.05 level of significance, that the variance of cholesterol levels of adult males is less...
According to a study done by UCB students, the height for Martian adult males is normally...
According to a study done by UCB students, the height for Martian adult males is normally distributed with an average of 67 inches and a standard deviation of 2.3 inches. Suppose one Martian adult male is randomly chosen. Let X = height of the individual. Round all answers to 4 decimal places where possible. a. What is the distribution of X? X ~ N(,) b. Find the probability that the person is between 62.1 and 65.3 inches. c. The middle...
According to a study done by UCB students, the height for Martian adult males is normally...
According to a study done by UCB students, the height for Martian adult males is normally distributed with an average of 68 inches and a standard deviation of 2.5 inches. Suppose one Martian adult male is randomly chosen. Let X = height of the individual. Round all answers to 3 decimal places where possible. a. What is the distribution of X? X ~ N(_____ , _____) b. Find the probability that the person is between 67.7 and 70.3 inches. _____...
The amount of coffee that people drink per day is normally distributed with a mean of 15 ounces and a standard deviation of 6 ounces. 13 randomly selected people are surveyed. Round all answers to 4 decimal places where possible. a. What is the distribution of X? X-N b. What is the distribution of m?T-NG c. What is the probability that one randomly selected person drinks between 14 and 16 ounces of coffee per day? d. For the 13 people,...
The cholesterol levels of adult males are approximately normally distributed with a mean of 224 mg/dl, and a variance, o', of 521. Some researchers claim that the variance of cholesterol levels of adult males is less than 521. A sample of 15 adult males' blood tests had a mean of 222.5 mg/dL and a variance of 192. Is there enough evidence to conclude, at the 0.05 level of significance, that the variance of cholesterol levels of adult males is less...
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