In Gombak district 2500 electric lamps are installed for street lighting. The lamps come from a different manufacturer and have a mean burning life of 1050 hours. We know from past experience that the distribution of burning lives approximates a normal distribution. The 250th lamp fails after 819 hours. What is the standard deviation of burning lives for this set of lamps? (e)

Q: The length of human pregnancies from conception to birth approximates a normal distribution with a…

A: Let X be length of time marks the longest 2.16 % of all pregnancies from normal distribution with…

Q: The distribution of grades in a final exam conforms to the normal distribution with an average of 60…

A:

Q: What is the standard deviation on the graph ?

A:

Q: A distribution consists of three requencies 250, 300, 350 having neans 30, 15 and 20 and standard…

A: We have given that  Size N1=250 , N2=300, N3=350 Sample mean xbar1 =30 , x2=15 , x3=20 Standard…

Q: The salaries of a company's employees are normally distributed with mean 15000 and standard…

A:

Q: The length of human pregnancies from conception to birth follows a bell shaped distribution with…

A: Given that  The distribution followed a bell shaped distribution. Mean (μ) =266 days Standard…

Q: A teacher says that the top 9​% of the class received an A on the last test. The scores were…

A: Given that the mean is 67 and the standard deviation is 18. That is, μ=67, σ=18 A teacher says that…

Q: The average salary of a male professor at a public four-year institution offering classes at the Dr…

A: Given Information : The average salary of a male professor at a public four-year institution…

Q: The lengths of pregnancies are normally distributed with a mean of 280 days and a standard deviation…

A:

Q: The red blood cell counts (in 10 cells per microliter) of a healthy adult measured on 6 days are as…

A:

Q: he mean life of a battery is 50 hours with a standard deviation of 7 hours. The manufacturer…

A: Given data,Mean μ=50standard deviation σ=7P(X<40)=?

Q: The length of human pregnancies from conception to birth approximates a normal distribution with a…

A:

Q: he distribution for the time a patient of a medical center spends waiting for an appointment is…

A: Given data,μ=35σ=12P(11<X<35)=?

Q: A particular fruit's weights are normally distributed, with a mean of 522 grams and a standard…

A: GivenMean(μ)=522standard deviation(σ)=32sample size(n)=20

Q: A large number of applicants for admission to graduate for study in businesss are given an aptitude…

A: Let X denote the aptitude test scores and it follows normal distribution with mean of μ=400 and…

Q: particular fruit's weights are normally distributed, with a mean of 395 grams and a standard…

A: We have given that Mean=395

Q: Human body temperatures in degrees Fahrenheit have a distribution that assumed to be symmetric and…

A: given data  normal distribution μ = 98.6σ = 0.9 hypothermic : bottom 1 % fever : top 1.5%

Q: Energy consumption for single family comes is a mean of 1050kw and standard deviation of 218kw. Find…

A: Given information- Population mean, μ = 1050 kw Population standard deviation, σ = 218 kw We have to…

Q: For woman at Hartford college, times to run 400 meters are normally distributed with a mean of 85…

A: Solution: Let X be the time to run 400 meters. From the given information, X follows normal…

Q: A certain standardized tests math scores have a bell shaped distribution with a mean of 525 and a…

A: GivenMean(μ)=525standard deviation(σ)=105

Q: The mean BMI score for dieters on the Jenny Craig weight loss program is 38.5, and the standard…

A: The normal distribution: A continuous random variable X is said to follow normal distribution with…

Q: The lengths of a particular animal's pregnancies are approximately normally distributed with mean of…

A:

Q: What proportion of people has diastolic blood pressure less than 80?

A:

Q: The time needed to take an exam is normally distributed with an average of 120 minutes and a…

A: Given,mean(μ)=120standard devition(σ)=20

Q: The length of human pregnancies from conception to birth approximates a normal distribution with a…

A: From the provided information, Mean (µ) = 268 Standard deviation (σ) = 17

Q: Ozlem Hoca's statistics STAT 410 class analyzed the lengths of the songs played on a local radio…

A:

Q: The mean gas mileage for cars driven by the students at Chillville High Schoo is 28.0 miles per…

A: Normal distribution is continuous distribution which has many real life applications. Standard…

Q: There is one male baby seal for every nine female baby seals. What is the average number of male…

A: p=P(male baby seal ) = 1/9 n=5

Q: The Psych 230 students finished the course with a total population mean of 130 points and the…

A:

Q: A student will spend 15 hours average each week in class. If the standard deviation is 2 hours, what…

A: Given that mean=15 and standard deviation = 2 Let, X= number of hours spent by a student in the…

Q: 21 year old men rates at rest are normally distributed with a mean of 70 beats per minute, and a…

A: Given that   21 year old men rates at rest are normally distributed Mean (μ)=70 beats per minute…

Q: Suppose that replacement times for washing machines are normally distributed with a mean of 8.8…

A:

Q: A particular fruit's weights are normally distributed, with a mean of 613 grams and a standard…

A:

Q: In a large section of a statistics class, the points for the final exam are normally distributed,…

A:

Q: The song-length of tunes in the Big Hair playlist of a Statistics professor's mp3-player varies from…

A:

Q: The distribution of grades in a final exam conforms to the normal distribution with an average of 60…

A: Given information: μ=60σ=8 The proportion of students required to pass=300350=0.857142857≈0.8571

Q: The quartile deviation of the number of computers fixed per day is 5. Interpret this  value. What…

A: Quartile deviation

Q: The annual per capita consumption of oranges (in pounds) in the United States  can be approximated…

A: It is given that the mean and standard deviation are 19.2 and 4, respectively.