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The number of components produced per hour is normally distributed with a mean of 25 and a standard deviation of 4.
a) What percentage of the time does a lathe produce more than 27 components per hour?
The manager of an EZ lube service station has reduced an oil-change job to a science and wants to keep it that way. The manager constantly monitors the performance of his staff. This week, 15 oil-change jobs were sampled with a sample mean of 9.8 minutes per job. Experience has shown that the times follow a normal distribution, and the standard deviation of the population is known to be 1.2 minutes. Based on this week's sample, construct a 90% confidence interval for the population mean (average time for an oil-change job).
An apartment-finder service would like to estimate the average cost of a one-bedroom apartment in Denton, Texas. A random sample of 41 apartment complexes yielded a mean of $310 with a standard deviation of $29. Construct a 90% confidence interval for the mean cost of one-bedroom apartments in Denton, Texas.
A bank manager would like to estimate the mean deposit by a customer into a savings account to within $500. If the deposits into savings accounts are considered to be normally distributed with a standard deviation of $1,250, what sample size would be necessary at a 90% confidence level to determine the same?
Based on this histogram, estimate the standard deviation of the sample of percentages. Carry your intermediate computations to at least four decimal places
How many days and hours since the Christian era commenced, 1811 years (Zerah usually assumed a 365-day year and a 30-day month)? How many days and hours since the Christian era commenced, 1811 years (Zerah usually assumed a 365-day year and a 30-d..
find the nearest distance using cosine rule.an airplane leaves an airport on a bearing of 450.nbsp after flying for 65
near a boy the depth of a lake at the point with coordinates x y is z 200 0.02x2 - 0.001y2 where x y and z are
1. how does technological advancement affect the ability to collect data? provide examples. does this advancement
At the first tri-city meeting, there are 8 people from town A, 7 people from town B, and 5 people from town C. If a council consisting of 5 people is randomly selected, find the probability that 2 are from town A and 3 are from town B.
Write an equation that can be used to determine the total cost, C(x), encountered by Marty's Company in producing x jackets, and use the equation to find the total cost of producing 94 jackets.
find critical points end points local extrema and global extrema.for the functionnbspnbsp fx fx x3-3x2nbspnbsp
The force needed to keep a car from skidding on a curve varies jointly as the weight of the car and the square of the speed and inversely as the radius of the curve.
The base of an aquarium with volume V = 325 is made of slate and the sides are made of glass. If slate costs five times as much (per unit area) as glass, find the dimensions of the aquarium that minimize the cost of the materials.
simple pendulum is related to the length L (in feet) of the pendulum by the formula 87t^2=(3.14)^2L. If a child is on a swing with a 10 foot chain, then how long does it take to complete on cycle on the swing?
thrree displacements are a 200 m due south b 250 m due west c 150 m 30.0deg east of north. construct a separate
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