An automobile battery manufacturer claims that its mid grade battery has a mean life of 50 months with a standard deviation of 6 months Suppose the distribution of battery lives of this particular brand is approximately normal. Find the probability that the mean of a random sample of 36 such batteries will be less than 48 months. Is the assumption of the manufacturers' claims true? Why?

Q: The average yearly Medicare Hospital Insurance benefit per person was $4064 in a recent year. If the…

A: The probability that it is less than 3800 when 20 patients chosen at random is obtained below: From…

Q: A random sample of 25 observations yield a mean of 116 and a standard deviation of 12. What is the…

A: Given data,Mean μ=116sd σ=12P(X>1150)=?

Q: In a recent year, 11th grade Ohio public school students taking an English test produced test scores…

A:

Q: The distribution of scores for the third exam in a statistics course has a mean of 74 and a standard…

A: Given Information: Mean, μ=74 Standard Deviation, σ=15 Sample Size, n=36

Q: In a recent year, 11th grade New York public school students taking an English test produced test…

A:

Q: The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an…

A: Given information- Population mean, μ = 1.8 pounds Population standard deviation, σ = 1.02 pounds We…

Q: Suppose the age a student graduates from Salem State is Normally distributed. If the mean age is…

A:

Q: In 1999, the murder rates (per 100,000) for the 50 states and the District of Columbia had a mean of…

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Q: The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an…

A:

Q: The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an…

A:

Q: Suppose IQ scores are normally distribut a mean of 100 and a standard deviation What is the…

A: Solution:  Let X be the IQ scores are normally distributed with mean 100 and standard deviation 15.…

Q: In a population of heroin users, the mean duration of heroin abuse is 5 years with a standard…

A: From the provided information, Mean (µ) = 5 years Standard deviation (σ) = 3 years X~N (5, 3) Sample…

Q: Suppose the age a student graduates from Salem State is Normally distributed. If the        mean age…

A: Given, mean = 23.1 Standard deviation = 3.1 We know, z = (x-mean)/std dev

Q: The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an…

A: Given data,Mean μ=1.8standard deviation σ=1.02If n=55P(X<1.9)=?

Q: The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an…

A: We have to find out given probability..

Q: The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an…

A:

Q: Suppose the average credit card debt for Americans is $7000 and is not normally distributed with a…

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Q: A study indicates that the weights of adults are normally distributed with a mean ? of 140 lbs and a…

A: 1.Let X be the weight of adults. X follows normal distribution that has mean µ = 140 and the…

Q: The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an…

A: To find: what is the probability that the mean weight loss after one week on this pill for a random…

Q: IUSS pill advertises that people who use the pill lose, after one week, an average (mean) of 1.8…

A: We have given that  X~N( μ , ?^2 )   Z-score =( x - μ )/?

Q: The annual salary for an emergency room nurse is a normally distributed random variable with a mean…

A: Mean()=80000standard deviation()=12000sample size(n)=36

Q: The scores of individual students on the ACT Exam are modeled as normally distributed with a mean of…

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Q: Suppose that, in 1995, the weight of 16-year old males in the United States was normally distributed…

A: Thank you for posting this question ! You have correctly chosen that a z test needs to be performed…

Q: The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an…

A:

Q: The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an…

A: Given values, μ=1.75σ=1.02x¯=1.68n=60

Q: The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an…

A: Given that mean =1.85,s.d =1.02,n=55,x bar =1.88

Q: Suppose that, in 1995, the weight of 16-year old males in the United States was normally distributed…

A: Null and the alternative hypothesis: The type of test is right tailed test The value of z-test…

Q: The daily withdrawals from an ATM located at a service station is normally distributed with a mean…

A: Given information: μ=5000, σ=800 x=6400 Use the formula for the normal distribution to determine the…

Q: In a research study, conducted by the National Institute of Health, 25 individuals were sampled…

A: From the given information, In a research study, conducted by the National Institute of Health, 25…

Q: The weight of people in a small town in Missouri is known to be normally distributed with a mean of…

A: Mean = 180 Standard deviation = 28 Sample size, n = 40

Q: Suppose the age of cars on the road is normally distributed with a mean of 6.9 years. If the…

A:

Q: 2. In a recent study of the lifetimes of cell phones, it is found that the average is 26.3 months.…

A:

Q: Suppose IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. What…

A: Let X denote the IQ scores and it follows normal distribution That is, X follows N(μ=100,σ=15) The…

Q: The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an…

A: Given that: X is normally Distributed with mean µ = 1.75 and standard deviation σ = 1.02 By using…

Q: The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an…

A: Given Information: The producer of a weight loss pill advertises that people who use this pill,…

Q: probability that a patient recovers from a rare blood disease is 0.4. If 15 people are known to have…

A: Given problem is binomial distribution Let, X: Patient recovers from a rare blood disease p=Prob. of…