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: Assume that the results are normally distributed. Pedro took an exam in a class in which the mean…

A: The formula for z-score is z = x - μσ where μ is the mean and σ is the standard deviation.…

Q: Assume that adults have IQ scores that are normally distributed with a mean of μ=105 and a standard…

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Q: A sample of n=25 scores has a mean of 68. Find the z-score for this sample. If it was obtained from…

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Q: Assume that the blood pressure data is normally distributed with a mean of 70.2 and a standard…

A: The variable x¯ is defined as the mean blood pressure levels. The sample size is 16, mean is 70.2,…

Q: The percent of fat calories that a person consumes each day is normally distributed with a mean of…

A: The mean percent of fat calories that a person consumes each day μ= 35 Standard deviation σ = 10…

Q: The mean score on a dexterity test for 12-year-olds is 30. The standard deviation is 5. If a…

A: From the given information, let X be the score on a dexterity test for 12-year-old student. The mean…

Q: The scores on a mathematics exam have a mean of 71and a standard deviation of 8. Find the x-value…

A: Let X denote the scores on a mathematics exam and it follows normal distribution with mean of…

Q: Assume that adults have IQ scores that are normally distributed with a mean of μ=105 and a standard…

A: Given that, Adults have IQ scores that are normally distributed with, Mean = 105 Standard deviation…

Q: A random sample of 25 observations yield a mean of 106 and a standard deviation of 12. Find the…

A: From the given information,Sample size 25, mean 106 and standard deviation 12

Q: The test scores are normally distributed with a mean of 78 and a standard deviation of 9. If 39…

A: Obtain the probability that the average score is between 80 and 84. The probability that the average…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 95.2 and a standard…

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Q: he IQ is normally distributed with a mean of 100 and a standard deviation of 15. Suppose one…

A: Given that  Mean=100 SD=15 X = IQ of an individual. The probability that a randomly selected person…

Q: Assume that adults have IQ scores that are normally distributed with a mean of μ=105 and a standard…

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Q: A simple random sample of 64 observations was taken from a large population. The sample mean and the…

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Q: The average number of pounds of red meat a person consumes each year is 196 with a standard…

A: Given data normally distributed with mean of 196 pounds and standard deviation of 22…

Q: The variable xx denotes the time taken in seconds for a computer link to be made between the…

A: It is given that the mean is 15 and the standard deviation is 3.

Q: A test score of 36 has an equivalent standard score (z-score) of -2.4. If the standard deviation is…

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Q: A process is normally distributed. If the standard deviation is 2.5 and P(X > 20) = 0.04. Find the…

A: From the provided information, Standard deviation (σ) = 2.5 And P (X &gt; 20) = 0.04

Q: Q is normally distributed with a mean of 100 and a standard deviation of 15.  When selecting samples…

A: It is given that, IQ is normally distributed with a mean of 100 and a standard deviation of 15. So,…

Q: Assume that adults have IQ scores that are normally distributed with a mean of μ=105 and a standard…

A: The random variable X follows binomial distribution. The population mean is 105. The population…

Q: IQ is normally distributed with a mean of 100 and a standard deviation of 15.  When selecting…

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Q: Scores on the SAT test have a mean of 1518 and a standard deviation of 325. If 100 students are…

A: Scores on the SAT test have a mean of 1518 and a standard deviation of 325.

Q: Assume that adults have IQ scores that are normally distributed with a mean of μ=100 and a standard…

A: Assume that adults have IQ scores that are normally distributed with a mean of μ=100 and a standard…

Q: Assume that adults have IQ scores that are normally distributed with a mean of μ=105 and a standard…

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Q: Assume that adults have IQ scores that are normally distributed with a mean of μ=105 and a standard…

A: GIVEN DATA, normal distribution μ=105σ=15 probability that a randomly selected adult has an IQ less…

Q: on an exam, Tom scores 12 points above the mean and has a z-score of z=+2.00. the standard deviation…

A: It is given that the difference between mean and raw score is 12 and the z score is 2.

Q: Assume that the results are normally distributed. Pedro took an exam in a class in which the mean…

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Q: A random sample of 11 items is drawn from a population whose standard deviation is unknown. The…

A: Given data Random sample 0f 11 items is drawnsample mean is x=920sample standard deviation is s=25

Q: The mean age of a random sample 25 people who were playing the slot machines is 48.7 years, and the…

A: That is, there is no evidence to conclude that the mean age of those playing the slot machines is…

Q: Assume that adults have IQ scores that are normally distributed with a mean of μ=105 and a standard…

A: Given,   Mean = 105 Standard deviation = 15   The objective is to find the probability that a…

Q: A population of score has μ  = 44. in this population, a score of X = 40 corresponds to z = -0.50.…

A: