A manufacturer knows from experience that the resistance of resistors he produces is normal with mean µ = 150 Ω and standard deviation � = 5 Ω. What percentage of the resistors will have resistance between 148 Ω and 152 Ω? Between 140 Ω and 160 Ω?

Q: The average thickness of books on a library shelf is 8.3 centimeters. The standered deviation is .6…

A: The mean is 8.3 centimeters and standard deviation is 0.6 centimeters. The books are undersized…

Q: In measuring ignition duration, an engineer estimates that the standard deviation is 0.05 seconds.…

A: We have given that  Standard deviation = 0.05  Margin of error =E=0.01 95% confidence interval.

Q: A random sample of 1000 oranges showed that the mean amount of juice per orange was 9.5 fluid…

A: A random sample of 1000 oranges showed that the mean amount of juice per orange was 9.5 fluid…

Q: A random sample of 1000 oranges showed that the mean amount of juice per orange was 7.4 fluid…

A: We are given the following data:N = 1000x = 7.4 ouncesσ = 1.5 ouncesa) We want to find the z-score,…

Q: The heights (in inches ) of males in the U.S. are believed to be normally distributed with mean μ.…

A: Sample size (n) = 25 Mean (x̅) = 69.72 inches Standard deviation (s) = 4.15 inches

Q: A student took measurements of the mass of an object using the same balance. The data obtained were…

A: Here Given  data of mass of objects using the same balance. Data are  1.383 g, 1,387 g, 1.389 g and…

Q: A researcher at a major hospital wishes to estimate the average cholesterol level of the adult…

A:

Q: 8

A: From the given information, The provided side of the square be a random variable X. Thus, X~Nμ=3.3,…

Q: A random variable, X, has a normal distribution with mean equal to 1000 and standard deviation equal…

A: Given Information: Mean μ=1000 Standard deviation σ=100 Area to the left of X is 65.17% i.e., 0.6517…

Q: At a temperature of 25°C, the resistances of a type of thermistor are normally distributed with a…

A: At a temperature of 25°C, the resistances of a type of thermistor are normally distributed with a…

Q: A sample of 3000 persons were surveyed for their weight in pounds, the mean weight is 135 lbs with a…

A: Consider that the mean and standard deviation of a random variable X are µ and σ, respectively.…

Q: Find the X value corresponding to z = +0.75 for a distribution with population mean of 90 and…

A: Solution: From given information, µ=90, σ=12 and z=0.75.

Q: From past experience it is known that the weights of salmon grown at a commercial hatchery are…

A:

Q: A researcher is interested in estimating the average salary of teachers in a large urban school…

A:

Q: Assume that z scores are normally distributed with a mean 0 and a standard deviation of 1. If Pl - b…

A: # z be the standard normal variates with mean 0 and standard deviations 1  To find value of b such…

Q: A simple random sample from a population with a normal distribution of 108 body temperatures has x =…

A: Given: s = 0.370.61 nn = 108108 The variance will be: s2 =0.37 The critical values for…

Q: The graph to the right depicts IQ scores of​ adults, which are normally distributed with a mean of…

A: the PDF of normal distribution is = 1/σ * √2π * e ^ -(x-u)^2/ 2σ^2standard normal distribution is a…

Q: Assume that the distribution of residuals is approximately normal with mean 0c m and standard…

A:

Q: A chemical engineer claims that the population mean yield of a certain batch process is 500 grams…

A: A chemical engineer claims that the population mean yield of a certain batch process is 500 grams…

Q: A random sample of 1000 oranges showed that the mean amount of juice per orange was 5.9 fluid…

A: Given, A random sample of 1000 oranges showed that the mean amount of juice per orange was 5.9 fluid…

Q: The lengths of metal bolts are normally distributed with mean u cm and standard deviation 7 cm. If…

A: Givenstandard deviation(σ)=72.9% of the bolts measure more than 68

Q: Suppose a marine scientist is measuring salinity levels of seawater samples from the Atlantic ocean.…

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Q: after 4 days. How far in terms of the standard deviation from the mean is the healing rate of the…

A: here from given information  μ = 6.7 daysσ = 0.8 days   here healing rates of wounds are normally…

Q: Suppose body temperature is normally distributed with mean of 98.30°F and a standard deviation of…

A:

Q: During 1 week an overnight delivery company found that the weights of its parcels were normally 20oz…

A: According to the given information, During 1 week of an overnight delivery company found that weight…

Q: A researcher is interested in estimating the average salary of teachers in a large urban school…

A: Confidence level = 95% standard deviation = 1050  margin of Error = 150

Q: Solve the given problem, Find  z, z value (area), graph the normal curve and the n. The mean inside…

A:

Q: The weights of a large number of miniature poodles are approximately normally distributed with a…

A: From the given information, let X be the number of weights of poodles. Here, X follows normal…

Q: 15. The velocities of cars in express way are normally distributed with a Mean of 90 km/hr and…

A: Given,mean(μ)=90standard deviation(σ)=10Z-score=2.5

Q: The standard deviation of a population of 500 volumes is 85cm. Find out how many units the sample…

A: Given that the population SD = 85 And standard error of mean is not more than 15

Q: A chemical engineer claims that the population mean yield of a certain batch process is 500 grams…

A: Given data: Mean = 500 Sample size = 25 Sample mean = 518 Sample standard deviation = 40 Given…

Q: A random sample of 1000 oranges showed that the mean amount of juice per orange was 7.8 fluid…

A:

Q: A lab technician is tested for her consistency by making multiple measurements of the cholesterol…

A: Solution: Given information: n=12 Sample size  σ= 1.2 mg/dL  Population standard deviation  s= 1.5…

Q: The specifications for a plastic liner for a concrete highway project calls for thickness of 3.0…

A: The specifications for a plastic liner for a concrete highway project calls for thickness of 3.0…

Q: A group of patients has a mean height of 160 cm and a standard deviation of 10 cm. What score (to…

A: It is given that mean height 160 and standard deviation 10. Aim is to find the cut off value for…

Q: If I want my estimate to be accurate, I want the error of pn to be small. How many people should I…

A: Given information: N = Total number of people polled N. p^N=Number of people polled who supported…

Q: Jack had an average score of 75 with a standard deviation of 3. Mikes z-score was 1.85. His actual…

A: We have given that,  X be the random variable from normal distribution with mean Or average score…

Q: A researcher wants to estimate the mean serum cholesterol level for college age women.  In a past…

A: Solution: From the given information, confidence level is 0.99, σ=42 and E=3.

Q: A nurse at a local hospital is interested in estimating the birth weight of intants. How large a…

A: CL = 98% Error, E = 2 ounces Standard Deviation,σ = 5 ounces

Q: A random sample of 1000 oranges showed that the mean amount of juice per orange was 8.2 fluid…

A: The mean is 8.2 and the standard deviation is 1.5.

Q: The mean weight of 500 male students in a certain college is 151 lbs. and the standard deviation is…

A:

Q: An article compared the dielectric constants between two types of asphalt, HL3 and HL8, commonly…

A: From the given information, An article compared the dielectric constants between two types of…

Q: The length of human pregnancies from conception to birth is known to be normally distributed with a…

A: From the provided information, Mean (µ) = 266 days Standard deviation (σ) = 16 days Let X be a…

Q: Since she scored standard deviations v the mean in economics and standard deviations V the mean in…

A:

Q: The graph to the right depicts IQ scores of​ adults, which are normally distributed with a mean of…

A: Given data,μ=100σ=15P(X>x)=0.65x=?

Q: The height of personnel of a security service are normally distributed with a mean of 161cm and a…

A: Given: μ=161σ=8 i) The proportion of the security service have heights between 152cm and 176 cm are…

Q: A random sample of 1000 oranges showed that the mean amount of juice per orange was 8.2 fluid…

A: Given: mean=8.2 ounces, standard deviation=1.5 ounces For part a: The objective is to determine the…

Q: Anthony wants to estimate the mean weight, in kilograms, of all Grade 1 pupils in an elementary…

A: Given information, The level of significance is,

Q: The heights of adult females are normally distributed with mean 160 cm and standard deviation 8 cm.…

A: The following information has been provided:   Also,  Pr⁡(X≥k) = 0.025