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Find the standard deviation of random variable x

 
 

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1.The average amount of time that high school seniors spend studying weekly is 6.5 hours with a standard deviation of ...

rd deviation of 3.2 hours. A sample of 35 high school seniors is selected. Find the following values, if possible. Please round your answers to four decimal places. If you should not find a probability, please write NA for your answer. What is the probability that the sample mean studying time is between 4 and 5 hours? What is the probability that the sample mean studying time is less than 6 hours? What is the probability that the sample mean studying time is more than 8.5 hours?
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2.3) Suppose that a piece of equipment produces steel pipes and malfunctions 5% of the time, if the next 4 ...

xt 4 tests are performed, find P(x=0), P(x=1), P(x=2),P(x=3) and P(x=4). SHOW ALL WORK TO GET CREDIT) 4) Use the confidence interval (99%) to solve the following question. A company is trying to establish the number of average amount of funds that are owed by its employees. They collect 1,000 accounts and found the sample average owed is $250 with a standard deviation of 10. Calculate the confidence interval (MUST SHOW ALL WORK TO GET CREDIT) 5) Use the t distribution formula and table to solve the following question. A random sample of 91 with a sample average of 90 and a standard deviation of 4.2 hours, calculate the confidence interval at 98% (MUST SHOW ALL WORK TO GET CREDIT) 6) A poll of 3,000 adults out of 5,500 was collected to found that they did not get a master’s degree. Calculate the confidence interval at 95%. (MUST SHOW ALL WORK TO GET CREDIT)
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4.You want to know the percentage of medical equipment companies that earned revenue greater than 87 million dollars. If the ...

illion dollars. If the mean revenue was 50 million dollars and the data has a standard deviation of 15 million, find the percentage. Assume that the distribution is normal. Round your answer to the nearest hundredth.
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5.Last year, the revenue for medical equipment companies had a mean of 80 million dollars with a standard deviation of ...

ard deviation of 18 million. Find the percentage of companies with revenue greater than 95 million dollars. Assume that the distribution is normal. Round your answer to the nearest hundredth.
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6.The heights of 15 members of Salindayaw Dance Company are normally distributed with a population mean of μ= 160.4 and ...

n of μ= 160.4 and a standard deviation of σ = 9.0760. If all possible samples of size 13 are drawn from this population, find the percentage of them that would have means between 154 centimeters and 156 centimeters?
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7.The heights of 15 members of Salindayaw Dance Company are normally distributed with a population mean of μ= 160.4 and ...

n of μ= 160.4 and a standard deviation of σ=9.0760. If all possible samples of size 13 are drawn from this population, find the percentage of them that would have means between 154 centimeters and 156 centimeters?
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8.Service departments of a car factory has 12472 customers. The average number of work orders from one customer is ...

e customer is 4 per year with the standard deviation 2. Find the probability that the total number of yearly claims in the service department does not exceed 50000.
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1.AU MAT 120 Systems of Linear Equations and Inequalities Discussion

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