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An automatic welding machine is being considered for production. It will be considered for purchase if it is successful for 99% of its welds. Otherwise, it will not be considered efficient. A test is conducted on a prototype that is to perform 100 welds. The machine will be accepted for manufacture if it misses no more than 3 welds.
(a) What is the probability that a good machine will be rejected?
(b) What is the probability that an inefficient machine with 95% welding success will be accepted?
The firm does not pay any dividends. Sales are expected to increase by 10 percent next year. If all assets, short-term liabilities, and costs vary directly with sales, how much additional equity financing is required for next year?
1.experiments on learning in animals sometimes measure how long a laboratory rat takes to find its way through a maze.
You are considering buying a new house in a new city. You want to know the average price of the houses in a new community to which you are considering moving
Duracell Ltd claim that the life of their batteries in motorised soft toys is approximately normally distributed with a mean of 102.9 hours and a standard deviation of 16.5 hours.
In a perfectly symmmetrical distribution: a) the range equals the interquartile range b) the interquartile range equals the mean c) the median equals the mean d) the variance equals the standard deviation
A study of 20 families in a certain large city showed that the average income was $33,210 in 2000 with a standard deviation of $1800. Test the hypothesis that the true average income in this city was actually $31,000 against the hypothesis that it..
Normal distribution what percentage of students will make A's and what percentage will make B;s in the exam. Suppose standard cut-off for (A>=90) and B (80
Using the following data on 15 workers, construct an exact 95% confidence interval for µ.
Suppose the regression equation that has been used to estimate the value of existing homes is as follows; Interpret the meaning of the slopes of this equation.
Consider two urns with the following composition: Urn 1 contains 5 red and 15 black balls, Urn 2 contains 8 red and 12 black balls.
What are the similarities between dividing two fractions and dividing two rational expressions?
In a large section of statistics class, the points for the final exams are normally distributed with a mean of 72 and a standard deviation of 9. Grades are to be assigned according to the following rule.
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