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An important subcomponent of a medical device produced by a manufacturing line is normally distributed with mean 70.2" and standard deviation is 1.26". (a) What is the probability that one randomly selected unit has a length exactly 72"? (b) What is the probability that one randomly selected unit has a length less than 72"? (c) What is the probability that one randomly selected unit has a length greater than 72"? (d) What is the probability that, if three units are randomly selected, none of them have lengths exceeding 72"?
High levels of glucose in the blood are indications of diabetes, which is becoming more prevalent in the United States. Diabetes can lead to many complications such as blindness and heart disease. A random sample of 180 individuals had their blood su..
10 cartons are taken at random from an automatic filling machine.The mean net weight of the carton is11.8 kg and standard deviation of 0.15kg. Does the sample mean differ significantly from the intended weight of 12kgs?
4. Although most of us buy milk by the quart or half gallon, farmers measure daily production in pounds. Ayreshire cows average 47 pounds of milk a day with a standard deviation of 6 pounds. For Jersey cows, the mean daily production is 43 pounds wit..
The company wants to formulate a linear programming model to determine the number of grams of each ingredient that must go into the drug in order to meet the antibiotic requirements at the minimum cost.
The length of a human pregnancy has a mean of 267 days and a standard deviatin of 16 days. Assume a normal distribution. What percent of pregnancies last over 283 days.
Estimate the mean study time for the population of all students. What is the probability that the sample mean exceeds the population mean by more than 2 hours?
A geologist has collected 10 specimens of basaltic rock and 10 specimens of granite. The geologist instructs a laboratory assistant to randomly select 15 of the specimens for analysis.
Determine a 99% confidence interval for mean pH in rainfall. How would you distinguish interval?
At the 5% significance level, can the station conclude that the mean age of its listeners is not 25 yrs. Formulate and test the appropriate hypotheses. Use the critical value approach.
Computing the mean value for the given data - What is the new mean for the class and frequency distribution graph, what type of graph should be used
Consider the following exponential probability density function: This number represents the time between arrivals of customers at the drive-up window of a bank.
When calculating confidence interval estimates...how is the x and standard deviation calculated? How to calculate one sided 95% confidence limits for a proportion.could you provide a formula ?
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