The number of people getting sick from imported meat products in a certain city in one month was found to be normally distributed with mean and standard deviation :X≈N (u= 190, σ=22). Below what number x, will be found 20 percent of the sick persons (80% of the sick persons will be greater than this number)

Q: A major credit card company has determined that the amount its customers charge on their accounts is…

A: Solution: Let X be the customers charge on their accounts. From the given information, X follows…

Q: The power reflected from an aircraft received by a radar is described by an exponential…

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Q: Use the formula to find the standard error of the distribution of differences in sample means,…

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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 simple regression of y vs x reveals, for n = 22 observations, that r = 0.73. The standard…

A: There are n = 22 observations.

Q: Find the z-score for the value 69, when the mean is 96 snd the standard deviation is 5. z-score= ?

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Q: A sample of university students has an average GPA of 2.78 with a standard deviation of 0.45.  If…

A: Given, A sample of university students has an average GPA of 2.78 with a standard deviation of 0.45.…

Q: The scores on a test are normally distributed with a mean of 70 and a standard deviation of 14, find…

A:

Q: In a sample of 12 randomly selected high school seniors, the mean score on a standardized test was…

A: Given : x¯ =1178 s = 163.3 μ = 1018 n = 12 t = x¯-μsn

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: Q4. The standard deviation of the temperature in a large refridgeratored room should not exceed…

A:

Q: a mean of Rs. 70 with a standard deviation of. Rs. 5. Estimate the The weekly wages of 1000 workmen…

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Q: A survey of high school seniors from a certain school district who took the SAT has determined that…

A: Given function f(x) is - f(x) = 114.52πe-x-7502420.5f(x) = 114.52πe-x2+7502-2×750×x420.5…

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: The mean weight of 500 male students at a certain college is 151 lb and the standard deviation is IS…

A:

Q: for 1 < x < 3 f(x) = otherwise. Calculate the standard deviation of X , giving your answer to two…

A: The mean of the function,   Substitute the values in the above equation.

Q: In the past Algebra classes, records show that the average score of the students in the mid-term…

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Q: Suppose that the antenna lengths of woodlice are approximately normally distributed with a mean of…

A:

Q: Find the standard deviation of the reaction times. 0.7

A: Let X denote the reaction times of a drug. We have to calculate the SD of sample of size n = 12

Q: In a sample of 14 randomly selected high school seniors, the mean score on a standardized test was…

A:

Q: X is Normally distributed with a mean of 500 and a standard deviation of 40. What is the value of…

A: X is normally distributed. and X~N(μ,σ)where  mean(μ)=500      and standard deviation(σ)=40find x?…

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: At one college GPA are normally distributed with a mean of 3 and a standard deviation of 0.6. What…

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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: According to the National Health Survey, the weights of adult males are normally distributed with a…

A: Given,        Mean μ=172        Standard deviation σ=31        Sample sizen=25

Q: On a recent calculus exam, a class mean was 75 with a standard deviation of 3.4. Calculate the…

A: From the provided information, Mean (µ) = 75 Standard deviation (σ) = 3.4 Let X be a random variable…

Q: At one college GPAs are normally distributed with a mean of 2.55 and a standard deviation of 0.49.…

A: Empirical rule says that in a normal data set, virtually every piece of data will fall within three…

Q: Adult men have heights with a mean of 69.0 inches and a standard deviation of 2.8 inches. Find the…

A: Given data mean=69.0 inches standard deviation=2.8 inches x=79.7 inches

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: E. Based on a survey, the mean weekly allowance of the Grade 11 students of XYZ University is…

A:

Q: In a sample of 15 randomly selected high school seniors, the mean score on a standardized test was…

A: Given that, Sample size n=15 Sample mean score x¯=1180 Sample standard deviation s=164.3 Population…

Q: the distribution of certain test scores  is a nonstandard normal distribution with a mean of 80 and…

A: Given:Population mean (μ) = 80Population standard deviation (σ) = 3

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: For a population with  = 15, a raw score of X = 82 corresponds to z = -0.60.  What is the mean for…

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

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: 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: Find the z-score when x is 5, mean equals 7, and standard deviation 3.

A: Solution: Let X be the random variable. Then, the z-score is calculated by using the formula

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 time (in minutes) it takes Greg to complete a homework problem is uniformly distributed…

A: X=Time it takes to complete a homework problem X~Ua,bwhere, a=15 and b=28hence, X~U15,28

Q: On a recent calculus exam, a class mean was 69 with a standard deviation of 2.4. Calculate the…

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Q: A score of X=75 is measured in a population with a mean of μμ=100. A z-score of z=+1.50 is…

A:

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: In a sample of 15 randomly selected high school​ seniors, the mean score on a standardized test was…

A: Sample size is 15. Sample mean and standard deviation are 1191 and 164.6 respectively. 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: For all parts of this problem, assume that the weights of tomatoes are normally distributed with a…

A: That means X follows N(1.8, 0.472)

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

Q: The mean weight of 500 male students at a certain college is 151 lb and the standard deviation is 15…

A:

Q: On an exam with a standard deviation of σ = 6, Tom’s score of X = 54 corresponds to a z-score of z =…

A: