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The length of time to complete a door assembly on an automobile factory assembly line is normally distributed with a mean of 6.7 minutes and a standard deviation of 2.2 minutes. For a door selected at random, what is the probability the assembly time will be:
a) 5 minutes or less?b) 10 minutes or more?c) between 5 and 10 minutes
A sample of 46 homes in a subdivision revealed that 20 were ranch style (as opposed to colonial, tri-level, or Cape Cod). Construct a 98 percent confidence interval for the true proportion of ranch style homes.
The amount of radioactive element R in grams present t years from now is given by the formula R = 10.9e-0.003t. How much of R is present initially?
Identify the sample and population. Also, determine whether the sample is likely to be representative of the population.
How many jackets should the store owner order if she wants to maximize her expected profit?
If the contents in the population of all cans follow a normal distribution, what is the probability that the mean contents of a six-pack are less than 12 oz?
Determine the probability that person's monthly gasoline (gallon) purchases will be less than 67 gallons.
The claim that ""40% of those persons who retired from an industrial job before the age of 60 would return to work if a suitable job was available" is to be investigated at the 0.02 level of risk.
Assume a linear relationship, use the least square method to find the regression coefficients bo and b1 and Predict the mean kilowatt usage when the average temperature is 50 degrees Fahrenheit.
The probability that more than 6 planes arrive in the next minute is _____.
The average number of days absent per student per year at West Valley School is 17 days with a standard deviation of 4 days. How many standard deviations from the mean is 6 absent days?
At the .01 significance level, can the manufacturer conclude that the price reduction resulted in an increase in sales?
Through the week ending September 16,2011, tiger woods was the leading money winner on the PGA tour with total earnings of $5,517,777. Of the top 10 money winners, 7 players used a title it's brand golf ball. Suppose that we randomly select 2 of t..
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