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The number of friends you have in Facebook: discrete continuous -13 points My Notes Ask Your...
The partial probability distribution of X, the number of defective tires on a randomly selected automobile checked at a...
The partial probability distribution of X, the number of defective tires on a randomly selected automobile checked at a certain inspection station, is given below. If one of those automobiled is equally likely to have either 2 or 3 defective tires, what is P[(X = 2) U (X = 4)] = P(2 U 4)? x 0 1 2 3 4 P(x) .54 .12 .20
5. -/1 points DevoreStat9 5.E.041. My Notes Ask Your Teacher Let X be the number of...
5. -/1 points DevoreStat9 5.E.041. My Notes Ask Your Teacher Let X be the number of packages being mailed by a randomly selected customer at a certain shipping facility. Suppose the distribution of X is as follows. 1 2 3 4 p(x) 0.2 0.4 0.1 0.3 (a) Consider a random sample of size n = 2 (two customers), and let be the sample mean number of packages shipped. Obtain the probability distribution of x 1 1.5 2 2.5 3 3.5...
1. -1.66 points ILLOWSKYINTROSTATI S.PR.012. My Notes Ask Your Teacher Find the probability that x falls...
1. -1.66 points ILLOWSKYINTROSTATI S.PR.012. My Notes Ask Your Teacher Find the probability that x falls in the shaded area. (Enter an exact number as an integer, fraction, or decimal.) 3 4 5 6 7 8 Show My Work (Optional) 2. -/1.66 points V ILLOWSKYINTROSTAT1 5.PR.004 My Notes Ask Your Teacher What does the shaded area represent? (Enter exact numbers as integers, fractions, or decimals.) Show My Work (Optional) -1.66 points V ILLOWSKYINTROSTAT1 5.PR.032 My Notes | Ask Your Teacher...
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...
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...
My Notes 2. -/1 points Ask Your Teacher DevoreStat9 6.E.008. In a random sample of 80...
My Notes 2. -/1 points Ask Your Teacher DevoreStat9 6.E.008. In a random sample of 80 components of a certain type, 20 are found to be defective (a) Give a point estimate of the proportion of all such components that are not defective. (b) A system is to be constructed by randomly selecting two of these components and connecting them in series, as shown here. The series connection implies that the system will function if and only if neither component...
4. -/1 points DevoreStat9 5.E.051. My Notes Ask Your Teacher Time taken by a randomly selected...
4. -/1 points DevoreStat9 5.E.051. My Notes Ask Your Teacher Time taken by a randomly selected applicant for a mortgage to fill out a certain form has a normal distribution with mean value 8 min and standard deviation 3 min. If five individuals fill out a form on one day and six on another, what is the probability that the sample average amount of time taken on each day is at most 11 min? (Round your answer to four decimal...
3. -11 points DevoreStat9 5.E.039. My Notes Ask Your Teacher It is known that 80% of...
3. -11 points DevoreStat9 5.E.039. My Notes Ask Your Teacher It is known that 80% of all brand A external hard drives work in a satisfactory manner throughout the warranty period (are "successes"). Suppose that n - 15 drives are randomly selected. Let X = the number of successes in the sample. The statistic xin is the sample proportion (fraction) of successes. Obtain the sampling distribution of this statistic. (Hint: One possible value xın is 0.2, corresponding to x =...
0.54/0.76 points Previous Answers DevoreSla19 3E 015 My Notes Ask Your Te Many manufacturers have quality...
0.54/0.76 points Previous Answers DevoreSla19 3E 015 My Notes Ask Your Te Many manufacturers have quality control programs that include inspection of incoming materials for defects. Suppose a computer manufacturer receives circuit boards in batches of five. Two boards are selected from each batch for inspection. We can represent possible outcomes of the selection process by pairs, For example, the pairs (1, 2) and (2, 1) represent the selection of boards 1 and 2 for inspection. (a) List the ten...
3. + -14 points StatsByL017.12.007. My Notes Ask Your Teacher Dr. Victory is a psychologist studying...
3. + -14 points StatsByL017.12.007. My Notes Ask Your Teacher Dr. Victory is a psychologist studying the effects of high-level classes, bullying, and music classes on the anxiety levels of middle school students. He has previously determined that the effects from class levels, bullying experiences, and music classes are independent. It has been determined that the probability that a student is taking a high-level English class is 0.21, the probability that a student has been bullied is 0.39, and of...
5. -/1 points DevoreStat9 5.E.041. My Notes Ask Your Teacher Let X be the number of packages being mailed by a randomly selected customer at a certain shipping facility. Suppose the distribution of X is as follows. 1 2 3 4 p(x) 0.2 0.4 0.1 0.3 (a) Consider a random sample of size n = 2 (two customers), and let be the sample mean number of packages shipped. Obtain the probability distribution of x 1 1.5 2 2.5 3 3.5...
1. -1.66 points ILLOWSKYINTROSTATI S.PR.012. My Notes Ask Your Teacher Find the probability that x falls in the shaded area. (Enter an exact number as an integer, fraction, or decimal.) 3 4 5 6 7 8 Show My Work (Optional) 2. -/1.66 points V ILLOWSKYINTROSTAT1 5.PR.004 My Notes Ask Your Teacher What does the shaded area represent? (Enter exact numbers as integers, fractions, or decimals.) Show My Work (Optional) -1.66 points V ILLOWSKYINTROSTAT1 5.PR.032 My Notes | Ask Your Teacher...
My Notes 2. -/1 points Ask Your Teacher DevoreStat9 6.E.008. In a random sample of 80 components of a certain type, 20 are found to be defective (a) Give a point estimate of the proportion of all such components that are not defective. (b) A system is to be constructed by randomly selecting two of these components and connecting them in series, as shown here. The series connection implies that the system will function if and only if neither component...
4. -/1 points DevoreStat9 5.E.051. My Notes Ask Your Teacher Time taken by a randomly selected applicant for a mortgage to fill out a certain form has a normal distribution with mean value 8 min and standard deviation 3 min. If five individuals fill out a form on one day and six on another, what is the probability that the sample average amount of time taken on each day is at most 11 min? (Round your answer to four decimal...
3. -11 points DevoreStat9 5.E.039. My Notes Ask Your Teacher It is known that 80% of all brand A external hard drives work in a satisfactory manner throughout the warranty period (are "successes"). Suppose that n - 15 drives are randomly selected. Let X = the number of successes in the sample. The statistic xin is the sample proportion (fraction) of successes. Obtain the sampling distribution of this statistic. (Hint: One possible value xın is 0.2, corresponding to x =...
0.54/0.76 points Previous Answers DevoreSla19 3E 015 My Notes Ask Your Te Many manufacturers have quality control programs that include inspection of incoming materials for defects. Suppose a computer manufacturer receives circuit boards in batches of five. Two boards are selected from each batch for inspection. We can represent possible outcomes of the selection process by pairs, For example, the pairs (1, 2) and (2, 1) represent the selection of boards 1 and 2 for inspection. (a) List the ten...
3. + -14 points StatsByL017.12.007. My Notes Ask Your Teacher Dr. Victory is a psychologist studying the effects of high-level classes, bullying, and music classes on the anxiety levels of middle school students. He has previously determined that the effects from class levels, bullying experiences, and music classes are independent. It has been determined that the probability that a student is taking a high-level English class is 0.21, the probability that a student has been bullied is 0.39, and of...
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