A study of the amount of time it takes a hiker to hike to the bottom of the Grand Canyon and back to the top shows that the mean is 12 hours and the standard deviation is 2.4 hours. If 9 hikers are randomly selected, find the probability that their mean hiking time is less than 10.8 hours. P(x<10.8 hours = P (z <

Q: On the midnight shift, the number of patients with head trauma in an emergency room has the…

A: From the provided information, a) The mean can be calculated as:

Q: A prototype automotive tire has a design life of 38,500 miles with a standard deviation of 2,500…

A: Given A prototype automotive tire has a design life which follows a normal distribution with  Mean…

Q: A population has a mean of 200 and a standard deviation of 50. Suppose a simple random sample of…

A: Given,Population mean (μ) = 200Population standard deviation (σ) = 50Sample size (n) = 100.We know…

Q: Assume that the readings at freezing on a batch of thermometers are normally distributed with a mean…

A: Standardized z-score:   The standardized z-score represents the number of standard deviations the…

Q: A population has a mean of μ=30 and a standard deviation of σ=8.If the population distribution is…

A: Obtain the standard z-score for the random variable M equals 34 The standard z-score for the random…

Q: A sample from a population witha mean of μ = 40, and a standard deviation of σ = 10, has a mean of…

A: Where,

Q: Based on previous studies of school children who were vaccinated and contracted the flu, the time in…

A: As per our guidelines we can solve first multiple-choice question and rest can be reposted.…

Q: A study indicates that the weights of adults are normally distributed with mean of 72 kg and a…

A: Given data,μ=72σ=8P(65&lt;X&lt;77)=?

Q: Q2: The diameter of the dot produced by a printer is normally distributed with a mean diameter of…

A: Given : Diameter of the dot is normally distributed with mean 0.002 and standard deviation 0.0004

Q: Suppose that a petrol station has its daily demand for petrol as normally distributed with a mean of…

A:

Q: A researcher interested in the age at which women have their first child surveyed a simple random…

A: Note- Since you have posted multiple questions, as per our guidelines we are supposed to answer only…

Q: Assume that the readings at freezing on a batch of thermometers are normally distributed with a mean…

A:

Q: Compute the standard score (Z-score) for x, when x = 40, the mean of the distribution = 50, and the…

A:

Q: Suppose that the average amount of ice cream that children eat at birthday parties is 3.6 oz, with a…

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

Q: Given a normal distribution (X) with mean = 100 and standard deviation (σ) = 10,  w hat is the…

A: X follows a Normal distribution with mean = 100 and S.D = 10 Then z=(x-mean)/SD = (x-100)/10…

Q: Suppose that chemistry exam scores gre normally distributed with a mean of 24 and a standard…

A:

Q: A normal distribution has a mean of u = 100 with o = 20. If one score is randomly selected from this…

A: Given information: A normal distribution is considered having: Population mean, μ=100 Population…

Q: The weights of the fish in a certain lake are normally distributed with a mean of 13lbs and standard…

A: Normal distribution, also known as the Gaussian distribution, is a probability distribution that is…

Q: Suppose that chemistry exam scores are normally distributed with a mean of 28 and a standard…

A: In question, Given that chemistry exam scores are normally distributed with a mean of 28 and a…

Q: The weight of a certain population of young helfers is approximately normally distributed with a…

A:

Q: Let X represent the amount of gasoline (gallons) purchased by a randomly selected customer at a gas…

A: Given: Sample size, n = 50Mean, μ = 11.5 Std. Dev, σ = 4.0

Q: a population has a normal distribution with a mean of 50 and a stadnard deviation of 10. if a random…

A: Given,mean(μ)=50standard deviation(σ)=10sample size(n)=9

Q: A prototype automotive tire has a design life of 38,500 miles with a standard deviation of 2,500…

A:

Q: A sample of n = 5 scores has Σ X = 20 and Σ X2 = 180. For this sample, what is the value of the…

A:

Q: solve the following problems Assuming that the scores of Grade 11 students in Statistics and…

A: NOTE: There are two separate questions. Though we are supposed to solve one question only, but I…

Q: If the average yield of a dunum of yellow corn is 800 kg, with a standard deviation of 40 kg, and…

A: Given that : X follow a normal distribution with mean (μ) 800 kg and standard deviation (? ) 40 kg.…

Q: A consumer survey indicates that the average household spends µ = 300 TL on heating per month during…

A:

Q: Suppose that the life expectancy of a certain brand of nondefective light bulbs is normally​…

A: Normal distribution is a continuous distribution which has many real life applications. Normal curve…

Q: The body temperatures of adults have a mean of 98.6° F and a standard deviation of 0.60° F. If 36…

A: Given that, Mean = 98.6 Standard deviation = 0.60 Sample size, n = 36

Q: chickens follow a normal distribution with a mean of ? kg and a standard deviation of ? kg. It is…

A: *Answer:

Q: Let the random variable X follow a normal distribution with a mean of 18 and a standard deviation of…

A:

Q: on average, research shows that people gain one to three pounds over the winter months. Let x denote…

A: Given : research shows that people gain one to three pounds over the winter months   Let x denote…

Q: The body temperatures of adults have a mean of 98.6° F and a standard deviation of 0.71° F. If 30…

A: From the provided information, Mean (µ) = 98.6 Standard deviation (σ) = 0.71

Q: 2.2% 2.2% 34.1% 34.1% 0.1% 0.1% 13.6% 13.6% μ-3σ μ-2σ μ-Ισ µ+lo ut20 µ+3o Frequency

A: The distribution of grades is as above:…

Q: A normal distribution has a mean of u=54 and a standard deviation of o=6, what is the probability of…

A: Let "X" be the raw score.

Q: If x is normally distributed with a mean of 5 and standard deviation of 2, find the P(x>8).

A:

Q: A normal distribution has a mean of u=54 and a standard deviation of o=6, what is the probability of…

A: Mean = 54 Standard deviation = 6 Sample size, n = 36

Q: If a random sample of 15 bolts is selected from your production process, compute the probability…

A: Let X denote the distribution of diameters of the bolt. Given that X follows N(mean = 1, SD = 0.1)…

Q: An experiment is performed to determine whether the average nicotine content of one kind of…

A:

Q: A population has a mean of 200 and a standard deviation of 50. Suppose a simple random sample of…

A:

Q: Suppose that X is a normal random variable with a mean of μ=10. If we know that Pr[X<46]=Pr[Z<3.00],…

A:

Q: A sample of n = 16 scores has a standard error of σM = 4. What is the standard deviation of the…

A: Sample size, n = 16 Standard error = 4

Q: A population has a mean of 60 and a standard deviation of 18. A sample of 81 observations will be…

A:

Q: A sample of n = 4 scores is selected from a normal population with a mean of µ = 50 and a standard…

A: Sample size, n = 4 Mean = 50 Standard deviation = 20

Q: a normal distribution has a mean of u=60 with o=15.  if one score is randomly selected from the…

A: let "x" be the score.

Q: The distribution of weekly salaries at a large company has a mean of $1000 and a standard deviation…

A: Given Mean=1000 Standard deviation=350 N=50

Q: population has a mean of 300 and a standard deviation of 40. Suppose a simple random sample of size…

A:

Q: ose the population of all public Universities shows the annual parking fee per student is normally…

A: mean = 110 standard deviation = 18 P(100&lt;x&lt;115) = ?

Q: Let the random variable x have a normal distribution with a mean value of 70 and a variance of 25.…

A: Given data: Mean = 70 Variance = 25 To find: P (x &lt; 80 ) = ?