An electrical company  claims that the average life of the bulbs it manufactures is 1200 hrs. with the standard deviation of 250 hrs. If a random sample of 100 bulbs is chosen, what is the probability that the sample mean will be. Greater than 1150 hrs. Less than 1250 hrs. Between 1150 and 1250 hrs.

Q: Find the probability that a randomly selected high school student who took the reading portion of…

A:

Q: The monthly utility bills in a city are normally​ distributed, with a mean of ​$100 and a standard…

A: We want to find given probability for given questions

Q: a study of the amount of time it takes a mechanic to rebuild the transmission for a 2005 Chevrolet…

A: Given : μ = 8.4 , σ= 1.8 and n= 40 By Central Limit Theorem, x̅ follows a Normal distribution with…

Q: e monthly utility bills in a city are normally​ distributed, with a mean of ​$100   and a standard…

A: Given: Mean, μ=100 Standard deviation, σ=15 (a)  Probability that a randomly selected utility bill…

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

A: From the given information,   Mean  = 35 Standard deviation = 7.5   The objective is to find the…

Q: The average time for a courier to travel from Manila to Pampanga is 200 minutes, and the standard…

A: given that  mean (μ) =200sd (σ) = 10

Q: The weights of newborn for hippopotami is approximately Normal, with a mean of 86 pounds and a…

A: Given,mean(μ)=86standard deviation(σ)=10

Q: n a recent year, the ACT scores for high school students with a 3.50 to 4.00 grade point average…

A:

Q: An electrical company claims that the average life of the bulbs it manufactures is 1 300 hours with…

A: According to central limit theorem if the population is normal or the sample size is at least 30,…

Q: If the total cholesterol values for a certain population are approximately normally distributed with…

A: Let X denote the total cholesterol values for a certain population and it follows normal…

Q: Traveling between two campuses of a university in a city via shuttle bus takes, on average, 31…

A: The given data are: Mean, μ=31 minutes Standard deviation, σ=5 minutes n=40 For sample average, z is…

Q: An electrical appliance made by Company A has an average life of 2500 hours, with a standard…

A: Given: Company APopulation mean μ1=2500Population standard deviation σ1=500Sample size n1=300Company…

Q: A report announced that the median sales price of new houses sold one year was $211,000​, and the…

A: Sample mean will also follow normal distribution with parameters,

Q: Furnace repair bills are normally distributed with a mean of 263 dollars and a standard deviation of…

A: Here, µ = 263 and σ = 25.

Q: A manufacturer knows that their items have a lengths that are skewed right, with a mean of 18.7…

A: It is given that the mean is 187, the standard deviation is 47 and the sample size is 34.

Q: The monthly utility bills in a city are normally​ distributed, with a mean of ​$100 and a standard…

A: Let X be the random variable from normal distribution with mean (μ) = 100 and standard deviation (σ)…

Q: In 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: An electrical company claims that the average life of the bulbs it manufactures is 1 300 hours with…

A: The mean is 1,300 and the standard deviation is 260 hours.

Q: The average number of milligrams (mg) of cholesterol in a cup of certain brand of ice cream is 660…

A: Step 1: Given: X~N(μ,σ)μ=660σ=35x=670

Q: The average time for a courier to travel from Manila to Pampanga is 200 minutes, and the standard…

A:

Q: he monthly utility bills in a city are normally​ distributed, with a mean of $100 and a standard…

A: Let X be the monthly utility bills in a city are normally distributed with mean μ=$100 and standard…

Q: he reading speed of second grade students in a large city is approximately​ normal, with a mean of…

A: P(X>96)=?

Q: The average credit card debt for public school teacher is 14,975. If the debt is normally…

A: Given, Average credit card debt for public school teacher=X=14975 Standard deviation= 5650…

Q: The average hourly sale of a certain ride in an amusement park is P148.75/hr with a standard…

A: Given information- Population Mean µ = P148.75/hr Standard deviation (σ) = P75.76 Let X be the…

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 5.6…

A: Given, μ=5.6σ=1.8

Q: The monthly utility bills in a city are normally​ distributed, with a mean of $100 and a standard…

A: (a) Let x be the monthly utility bills in a city which follows normal distribution with mean 100,…

Q: A. C. Neilsen reported that children between the ages of 2 and 5 watch an average of 25 hours of…

A: Let x be the number of hours ages of 2 and 5 watch television which follows normal distribution with…

Q: A sample of university students has an average GPA of 2.78 with a standard deviation of 0.45. If GPA…

A: Let X be a continuous random variable of average GPA of university students is normally​ distributed…

Q: In a given year, the average annual salary of a cricket player was $205 000, with a standard…

A: The probability that the sample mean will be less than $210,000 is,…

Q: A waitress believes the distribution of her tips has a model that is slightly skewed to the right​,…

A: a) The probability that she will earn at least $350 is obtained below: From the given information,…

Q: The weights of newborn for hippopotami is approximately Normal, with a mean of 85 pounds and a…

A: Given  Mean, μ=85 pounds and standard deviation, σ=12 pounds

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: For a certain type of computers, the length of time between charges of the battery is normally…

A: According to the provided information, Mean (µ) = 50 hour Standard deviation (σ) = 15 hour

Q: The population average fuel efficiency of U.S. light vehicles for 2005 was 21 mpg. If the standard…

A: Given,sample size (n)=25sample mean(μ)=21standard deviation(σ)=2.9

Q: The monthly In distributed, with mean of $100 standard deviation of $13. Find the probability that a…

A:

Q: The number of calories in a certain dessert is normally distributed with a mean of 210 and a…

A: We have to find the probability that the dessert one selects will contain between 185 and 216.

Q: A certain type of storage battery last on average, 3.0 years with a standard deviation of 0.5 year.…

A:

Q: he average weekly unemployment benefit in Idaho is $272. Suppose that the benefits are normally…

A: We have given that  Sample size n=15 , mu=272 ,sigma =43 X~N(mu,sigma^2)

Q: In a recent study, the Centers for Disease Control and Prevention reported that the diastolic blood…

A: given that mean(μ)= 80.5 standard deviation (σ) = 9.9

Q: An electrical company claims that the average life of the bulbs it manufactures is 1200 hours with…

A:

Q: The amounts of time per workout an athlete uses a stairclimber are normally​ distributed, with a…

A:

Q: An electrical appliance made by company A has an average life of 2500 hours, with a standard…

A: Given : μ1 = 2500μ2 = 2300n1 = 300n2 = 200σ1 = 500σ2 = 800

Q: he weights of truffles follow a normal distribution, with a mean weight of 347 grams and a standard…

A: Here it is given that - Mean (μ) = 347 Standard deviation (δ) = 15.3 Let X be the weight of truffles…

Q: What percentage of the class has a test score between 68 and 82? Approximately how many students…

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

Q: The diameter of a brand of tennis balls is approximately normally distributed with a mean of 2.5…

A: Given that, Mean = 2.5 Standard deviation = 0.5 Sample size = 50

Q: The lifetime of a particular brand of AA batteries follows a normal distribution. The mean lifetime…

A: Correct answer is d. 0.0606

Q: The photoresist thickness of wafers in semiconductor manufacturing has a mean of 10.6 micrometers…

A: Let, X=The photoresist thickness of wafers.  Given that X follows a normal distribution with…

Q: Assume that the heights of women are normally distributed with a mean of 63.6 inches and a standard…

A: GivenMean(μ)=63.6standard deviation(σ)=2.5sample size(n)=100

Q: Supppose the average age of family members is 34 with a standard deviation of 4.If the members of…

A:

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 10.3…

A: