Suppose the number of cell phone calls made or received per day by cell phone users follows a normal distribution with a mean of 13.1 and a standard deviation of 4.3. Use this information to answer questions 6-9 6) Find P(x< 12)

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Q: The Weather Underground reported that the mean amount of summer rainfall for the northeastern US is…

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A: Given that a normal distribution has a mean of 50 and a standard deviation of 3. That means μ=50 and…

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 267 days…

A: Solution: Let X be the length of pregnancies in a small rural village From the given information, X…

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 262 days…

A: Given information- Population mean, µ = 262 days Standard deviation, σ = 17 days Significance level,…

Q: The income of a group of 10,000 persons was found to be normally distributed with mean AED 1750pm…

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Q: 1. The scores on a test have a mean of 100 and a standard deviation of 15. If a personnel manager…

A: Formula : Z =(X - μ)/σ

Q: Suppose the data have a bell-shaped distribution with a mean of 40 and a standard deviation of 7.…

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Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 261 days…

A: From the given Information, Let X represent the length of pregnancies in a small rural village and…

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A: We are given that,Standard deviation = σ = 6And a score that is 12 points above the mean

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Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 264 days…

A: Let X denote the length of pregnancies in a small rural village. According to the given information.…

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A: we have to find z score

Q: Suppose that the scores on a statewide standardized test are normally distributed with a mean of 71…

A: Since you have posted a question with multiple sub-parts, we will solve first three subparts for…

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 268 days…

A:

Q: In a certain factory of rags, the time it takes for the workers to finish one rag is normally…

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A: It is given that p is 0.10.

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A: The z score is used to test the probability of normal distribution. It is also known as standard…

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 267 days…

A:

Q: If 10 were added to each of the values in a data set that originally had a standard deviation of 6,…

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Q: Suppose a company produces lightbulbs with a mean lifetime of 1000 hours and a standard deviation of…

A: Given that, Mean= 1000 And standard deviation, sigma= 50 We know that, Z Score= (X-mu)/sigma

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Q: A given distribution has a population mean, μ, of 139 and a population standard deviation, σ, of 15.…

A: Given data, Mean( μ)=139 sd( σ)=15 If x=81 z=?

Q: Suppose that the scores on a statewide standardized test are normally distributed with a mean of 71…

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Q: The average grade for an exam is 74, and the standard deviation is 7. If 12% of the class is given…

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Q: If one normal distribution has a standard deviation of 5, and another has a standard deviation of…

A: Given that  One normal distribution has standard deviation is 5. Another has standard deviation of…

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A: Assume random variable X denotes the lengths of pregnancies in a small rural village. It is given…

Q: Suppose the data have a bell-shaped distribution with a mean of 30 and a standard deviation of 5.…

A: Given data ,u=30σ=5

Q: For a normally distributed population with a mean of 35 and a standard deviation of 7.5, what value…

A: X follows a Normal distribution with mean = 35 and S.D = 7.5 Then z=(x-mean)/SD = (x-35)/7.5…

Q: Suppose a normal distribution has a mean of 50 and a standard deviation of 3. What is P(xs 53)?

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

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Q: A given distribution has a population mean, μ, of 144 and a population standard deviation, σ, of 9.…

A: Solution: Let X be the random variable. From the given information, X has a population mean µ=144…

Q: For a normally distributed population with a mean of 35 and a standard deviation of 7.5, what value…

A: From the given information, normal distribution with population mean as 35 and standard deviation as…

Q: Suppose that for the past several decades, daily precipitation in Seattle, Washington has had a mean…

A: Power of the test is the probability of rejecting null hypothesis when the null hypothesis is false.…

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 263 days…

A: Solution-: Given: μ=263 days, σ=13 days We want to find what range would you expect to find the…

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 263 days…

A: The mean is 263 and the standard deviation is 14 days.

Q: A set of data items is normally distributed with a mean of 40 and a standard deviation of 8. Convert…

A: Given:  Random variable x follow normal distribution with mean mu=40 ,sd=8  Then z score:…

Q: Assume that males have a mean hieght of 69.1 in. with a standard deviation of 2.9 in., and females…

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Q: Suppose that the scores on a statewide standardized test are normally distributed with a mean of 65…

A: Given information- Mean, μ = 65 Standard deviation, σ = 4 a) The percentage of scores that were…

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

A: Solution-: Given: Z are normally distributed with mean of 0 and a standard deviation 1  If…

Q: Suppose that the scores on a statewide standardized test are normally distributed with a mean of 70…

A: Let , X denotes  scores on a statewide standardized test .  Therefore , X - &gt; N (mean = 70 , sd =…

Q: Suppose that water usages in American showers are normally distributed, with an average shower using…

A: Hey there! Thank you for posting the question. Since your question has more than 3 parts, we are…

Q: Suppose that the mean cranial capacity for men is 1040 cc (cubic centimeters) and that the standard…

A:

Q: The average grade for an exam is 74, and the standard deviation is 7. If 12% of the class is given…

A: Given: Average=74 Standard deviation=7 z value for 88th percentile z=1.18(consulting the table…

Q: Assume that the heights of adult puffins are normally distributed, with a mean of μ=μ= 15.9 inches…

A: Given data, μ= 15.9  σ= 2.7  n=28 mean of the distribution of x¯  =?

Q: Suppose that the scores on a statewide standardized test are normally distributed with a mean of 60…

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Q: Suppose that the scores on a statewide standardized test are normally distributed with a mean of 69…

A: Let X denote the scores on a statewide standardized test and it follows normal distribution with…