ose that we know, in addition, thất the standard deviation of the student's test on the final is 8.8. hat is a lower bound of the probability (in three decimal places) that the student core between 61.5 and 81.5 ?

Q: The tine spent by a teacher at woek in the holidays is nonually distributed with a mean of 20 hours…

A: From the above data Third option is correct 17.8

Q: 3. In a Math test, the mean score is 45 and the standard deviation is 4. Assuming normality, what is…

A: Since you have submitted two questions, we'll answer the first question. For the second question…

Q: "Ch6. Traveling between University of Santo Tomas and Rizal Park, Manila via shuttle bus takes, on…

A: Solution: Let X be the transport time. From the given information, X has mean µ=31 minutes and a…

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A:

Q: The Economic Policy Institute periodically issues reports on wages of entry-level workers. The…

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A: Given :  population mean , u = 120 bpm

Q: n a recent​ year, the scores for the reading portion of a test were normally​ distributed, with a…

A: Given that, Mean = 22.9 Standard deviation = 6.7

Q: suppose that ? is normally distributed with mean of 105 and standard deviation of 28. A. What is…

A: suppose that x is normally distributed with mean of 105 and standard deviation of 28.

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A: It is given that customers at a certain pharmacy spend an average of 54.40, with a standard…

Q: Suppose the weights of 3-month-old babies are normally distributed—baby boys with a mean of 14.4…

A: The normal distribution is the most useful theoretical distribution for continuous variables.…

Q: The standard deviation of the lifespan of a certain brand of LED light bulbs Is 20 months. The…

A: We have given that. 1) X~N( μ , ?^2 )   μ =147 , ? =20 , n=70   Z-score =( x - μ )/?

Q: At a certain bank, the mean checking account balance is ?=?150 and the population standard…

A: Given data: Mean = 150 Population standard deviation = 70 Sample size = 450 To find:  (i) Between…

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Q: A hydraulic press is operating correctly when the standard deviation of the pressure is at most 120…

A: It is given that a hydraulic press is operating correctly when the standard deviation of the…

Q: The tip percentage at a restaurant has a mean value of 18% and a standard deviation of 6%. What is…

A: Given Information: Mean: μ=18Standard deviation: σ=6 The sample size is n=15.

Q: Suppose that ?X is normally distributed with mean 105 and standard deviation 23. A. What is the…

A: Given : Let X is normally distributed with Mean (μ)=105 Standard deviation (σ)=23

Q: Full time Ph.D. students receive an average of $13,537 per year. If the average salaries are…

A: Introduction: Define X as the random variable of interest here, which denotes the salary of the…

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A: Given: μ=72σ=12 The percentage of the bags should have popped 60 kernels or more is obtained as…

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A: From the given information the z statistic is obtained as 1.66 standard deviation above the mean.

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A: We have given the following statement about the standard deviation of the sample mean.

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A: Given information- Population mean, μ = $25,575 Population standard deviation, σ = $7200 a) Sample…

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Q: A College Alcohol Study interviewed an SRS of 1000 college students about their drinking habits.…

A:

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Q: Newborn elephant calves usually weigh between 200 and 250 pounds-until October 2006, that is. If,…

A: Given  μ=225, σ=45,  P(280<X<350)= ?  Note: This probability value calculate from standard…

Q: "Ch6. Traveling between University of Santo Tomas and Rizal Park, Manila via shuttle bus takes, on…

A: Central Limit Theorem for mean: If a random sample of size n is taken from a population having mean…

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A: Given  μ=33, n=51, x̄=12 ans s=11

Q: A used car dealer says that the mean price of a three-year-old sports utility vehicle is $24,000,…

A:

Q: On a mathematics test in a high school, scores are normally distributed with a mean of 77 and a…

A: Given that.   X~N( μ , ?^2 )   μ=77     , ?=16.8   Z-score =( x - μ )/?

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A: It is given that n=100 and p=0.10.

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Q: In a certain distribution, the mean is 40 with a standard deviation of 3.  At least what fraction of…

A: We apply the Normal distribution method to solve the given problem.

Q: 1) A college professor decides to enter grades in terms of standard deviation. The grades are…

A: Given: μ=80 and σ=6. a)PX≥90=PX-μσ≥90-μσ=PZ≥90-806=PZ≥1.67=1-PZ<1.67=1-0.9525=0.0475 Therefore,…

Q: Johnson Electronics Corporation makes electric tubes. It is known that the standard deviation of the…

A: Given: x=2500σ=145n=105 The probability that the sample mean is within 22 hours of the mean life of…

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A: Given X~Bin(n,p)

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Q: The average credit card debt for college seniors is $3262. If the debt is normally distributed with…

A: It is given that the credit card debt has a normal distribution with mean $3262 and standard…

Q: The distribution of SAT scores is roughly normal. The mean on the SAT is a 1060 with a standard…

A: Mean(µ) = 1060 Standard deviations (σ) = 195 X ~ N (µ, σ )= N ( 1060, 195)

Q: The Aluminum Association reports that the average American uses 56.8 pounds of aluminum in a year. A…

A: It is given that the mean is 56.8 and standard deviation is 12.3.

Q: Suppose you sample one value from a uniform distribution with a =0 and b= 50. a. What is the…

A: Let X be a random variable which follows uniform distribution with probability distribution function…

Q: Heneroso & Co. distributes Christmas baskets to each employee with a mean cost of 2,500 pesos and a…

A:

Q: "Ch6. Traveling between University of Santo Tomas and Rizal Park, Manila via shuttle bus takes, on…

A: It is given that the travelling time follow normal distribution with mean 31 minutes and standard…