Question 4 (a) At a certain community college, the time that is required by candidates to complete the general knowledge competency examination is normally distributed with a mean of 57.5 minutes and a standard deviation of 6 minutes. Find the probability that a candidate takes between 56 minutes and 1 hour to complete the examination.

Q: Question 1: If X is normally distributed with mean 32 and standard deviation 4. Find the probability…

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Q: QUESTION 31 "A population of score is normally distributed and has a mean = 172 with standard…

A: Formula : Z =(X - μ)/σ

Q: QUESTION 2: 1- In order to be accepted into a top university, applicants must score within the top…

A: Given, mean(µ)=1000 Standard deviation (σ)=200 In order to be accepted into a university, applicants…

Q: Question 26: resting body temperatures are normally distributed with an average of 98.25 degrees…

A: Let X denote the resting body temperatures are normally distributed with an average of μ=98.25…

Q: QUESTION 3 A machine that produces a major part for an airplane engine is monitored closely. In the…

A: Given,margin of error(E)=0.04standard deviation(σ)=0.30α=1-0.95=0.05α2=0.025Z0.025=1.96      (from…

Q: A cereal-packing company where the content of cereal boxes must have a mean of 368 grams and a…

A: We have to find probability corresponding to sample mean ( x¯ ) So we have to use sampling…

Q: In a recent year, about two-thirds of U.S. households purchased ground coffee. Consider the annual…

A: The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ are the mean…

Q: QUESTION 2 The IQ test has a mean of 100 and a standard deviation of 15. Suppose a simple random…

A: The standard error can be calculated as: SE=σn Here, σ = Standard deviation n = Sample size

Q: QUESTION 5 The television picture tubes of manufacturer Sumsun have a mean lifetime of 7 years and a…

A: Given: μ1 = 7 σ1 = 0.8 n1 = 64 μ2 = 6 n2 = 49 X1-X2 = 0.8 Formula Used:   Z = X1-X2-μDσ12n1+σ22n2

Q: In a recent year, about two-thirds of U.S. households purchased ground coffee. Consider the annual…

A: we have given that  mean(mu)=45.16  standar deviation (sigma) =10.00 X~N(mu=45.16 , sigma =10.00)

Q: The lifetime of a certain battery has an unknown distribution with mean value of 8 hours and…

A: Points on sampling distribution of the sample mean: If the true population distribution of a random…

Q: QUESTION 2 Suppose that the counts recorded by a Geiger counter follow a Poisson process with an…

A: Solution : Let X be the exponential random variable arising from Poisson process with rate λ=2…

Q: QUESTION 7 The weekly salaries of public health workers in one state are normally distributed, with…

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Q: The length of a fully grown hibiscus plant is normally distributed and has a mean 35cm. It is found…

A: Let X ne the length of  a fully grown hibiscus plant is normally distributed with mean 35 cm and…

Q: QUESTION 3 If a random sample of size 15 is drawn from a normally distributed population with mean…

A: Given : X follows t distribution.

Q: QUESTION 6 At QT Sugar factory the amounts which go into bag of sugar are supposed to be normally…

A: Given that,  Amount of sugar into bag (X) is normally distributed with mean μ=36 kg and standard…

Q: Question 4) (6 points) According to the Department of Health, Statistics Students sleep an average…

A:

Q: Find the probability that a household spent more than $50.00. Enter your result as a value with 5…

A: Given that  The expenditures are approximately distributed as normal. Mean (μ) = $45.16 Standard…

Q: QUESTION 19 A random sample of n = 169 scores is selected from a population whose mean = 195 and…

A:

Q: In a recent year, about two-thirds of U.S. households purchased ground coffee. Consider the annual…

A: μ = 45.16σ = 10.00x = 50.00

Q: QUESTION 7 Suppose that total cholesterol in US men aged 35-44 can be modeled by a normal…

A:

Q: a. What is the probability that a laser fails before 6060 hours?  b. If 9 lasers are used in a…

A: The lifetime of a semiconductor laser at a constant gower is normally distributed with a mean of…

Q: In recent years, about two-thirds of U.S. households purchased ground coffee. Consider the annual…

A: We have find given proportion of households spent within one (1) standard deviation of the mean...

Q: Chapter 07, Section 7.4, Problem 041 X Your answer is incorrect. Try again. A machine at Katz Steel…

A: Let the random variable X be the length of nails. Given that the length of nails normally…

Q: Tommy Wait, a minor league baseball pitcher, is notorious for taking an excessive amount of time…

A: Obtain the standard z-score for the random variable X equals 40.60. The standard z-score for the…

Q: answer. The table is inserted. i. Find the standard deviation σ. [4] ii. When plants are chosen for…

A: Given Information Mean µ = 35 P(X>45) =0.05 P (Z > z) = 0.05 P(Z <z) = 1 – 0.05 =0.95 (i)…

Q: Question 6 – The average starting salary of this year's graduates of a large university (LU) is…

A: Hi, thank you for the question. As per our Honor code, we are allowed to attempt first three sub…

Q: The amounts of ice cream in all such cartons have a normal distribution with a mean of 16 ounces and…

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Q: Question 3 A set of final examination grades in an introductory statistics course is normally…

A: Given problem Given that A set of final examination grades in an introductory statistics course is…

Q: QUESTION 4 An astronomer wants to measure the distance from his observatory to a distant star.…

A: Given, mean = 10, sd = 2 , e = 0.5

Q: A bank's loan officer rates applicants for credit. The ratings are normally distributed with a mean…

A: From the information, the mean is 200 and the standard deviation is 50.

Q: Question 2 (Chp.7) If the duration of lung cancer from the onset of symptoms until death ranges from…

A:

Q: Question 4 As a part of the productivity assessment at a company, the HR manager carried out a…

A: 4. Let X denote time spent at work per week. Given- X~N35, 4 a. To calculate P[X<40] CLT is used…

Q: Two companies, A and B, drill wells in a rural area. Company A charges a flat fee of 3669 dollars to…

A: Given , Mean ll =250 tco-1                      Standard deviation =45tco-1 Company A =$3669 Company…

Q: QUESTION 4:   If the average yield of cucumber acre is 800 kg, with a variance 1600 kg, and that…

A:

Q: QUESTION 6 The lifetime of a certain battery is normally distributed with mean value of 10 hours and…

A: Let X be the lifetime of a battery. Mean is μ=10 hours. Standard deviation is σ=1 hour. The number…

Q: cereal-packing company where the content of cereal boxes must have a mean of 368 grams and a…

A: Solution: Given information: μ= 368 grams Population mean σ= 15 gram  Population standard deviation…

Q: Question 8: 8.1. If the mean value for the cashier to checkout of a market is 3 minutes. What is the…

A: In question, Let X denote the time in which the cashier to checkout of a market. Then X~Poisson(3)…

Q: Question 3)  According to the Department of Education, the time college students spend on their…

A: We have to find probability..

Q: Question 3: The Scores on the Graduation project examination are normally distributed with a mean of…

A: We have given that,  X be the random variable from normal distribution with mean (μ) = 527 and…

Q: Question 4)  According to the Department of Health, Statistics Students sleep an average of 8 hours…

A: Given: μ=8σ=1.5 The probability that a randomly selected statistics student sleep less than 6 hours…

Q: cereal-packing company where the content of cereal boxes must have a mean of 368 grams and a…

A: From the given information we want to find the probability that sample mean is below 365

Q: QUESTION 8 Supposa that total cholesterol in US men aged 35-44 can be modeled by a normal…

A:

Q: Question 2 A particular fruit's weights are normally distributed, with a mean of 718 grams and a…

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Q: Question 6: If the random variable X has a normal distribution with mean 40 and std. dev. 5,…

A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts.  In case…

Q: The distribution of the weights of a certain type of mangoes is normally distributed with a mean of…

A: The random variable permeability index follows normal distribution. The population mean is 150. The…

Q: In a recent year, about two-thirds of U.S. households purchased ground coffee. Consider the annual…

A: Given, Mean μ = 45.16Standard deviation σ = 10 Value within standard deviation  Lower limit = μ - σ…

Q: Question 1: A random variable is distributed normally with mean 3200 and standard deviation 800.…

A:

Q: Question 4 Most graduate schools of business require applicants for admission to take the Graduate…

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