A company has a policy of retiring company cars; this policy looks at number of miles driven, purpose of trips, style of car and other features. The distribution of the number of months in service for the fleet of cars is bell-shaped and has a mean of 56 months and a standard deviation of 4 months. Using the 68-95-99.7 (Empirical) Rule, what is the approximate percentage of cars that remain in service between 48 and 52 months? The approximate percentage of cars that remain in service between 48 and 52 months is  %. Do not enter the percent symbol.)

Q: Assume that the hourly costs of operating a commercial aircraft are normally distributed with a mean…

A:

Q: The number of goals scored by a college soccer team for a given season are 4, 9, 0, 1, 3, 12, 3, 7,…

A: The population mean is, μ=∑xN=4+9+0+1+3+12+3+7+4+5+8+212=5812=4.8333 The population mean is 4.8333.

Q: For this set of data, the standard deviation (s) is equal to: 9, 8, 10, 5, 5, 2, 3, 6, 3

A: Mean:The formula for finding mean is shown below:

Q: for this set of data, the standard deviation is equal to: 9,8,10,5,5,2,3,6,3

A: Mean:The formula for finding mean is shown below:

Q: The ages of the members of a popular ski club is normally distributed with a mean of 46 years and a…

A: Given that the ages of the members of a popular ski club is normally distributed with a mean of 46…

Q: The lengths of brook trout caught in a certain Colorado stream are normally distributed with a mean…

A: Given that :  Mean = 14 inches S. D = 3 inches Here we use standard normal distribution concept…

Q: Suppose the life span of a brand of lightbulbs is normally distributed with a mean of 2000 hours and…

A: It is given that  Mean, μ = 2000 Standard deviation, σ = 320 Z-Score, Z = ( X - μ )/σ

Q: The mean rate for cable t.v.from a sample of 80 households was $29 per month with a standard…

A:

Q: The time taken to boil a kettle is normally  distributed with a mean of 94 seconds and  a standard…

A: The provided information is  µ=94 σ=6 P(-a<X<a)=0.40…

Q: What is the standard deviation of the data set 14,23,9,12,21,18,8

A:

Q: A set of wrist watch prices are normally distributed with a mean of 76dollars and a standard…

A: From the provided information, Mean (µ) = 76 Standard deviation (σ) = 10 X~N (76, 10) Here X be a…

Q: n a qualifying examination for admittance to the BS Psycholo the mean score was 75 and the standard…

A: Given that  mean =75 ,s.d = 8

Q: e heights of adult men in the United States are normally distributed with a mean of 70 inches and a…

A: Given: μ=70, σ=2.5 The corresponding z-value needed to be computed: The probability that men in US…

Q: The following are ages in years of nine employees of a large company. 46, 22, 35, 26, 22, 53, 33,…

A: The question is about measures Given : Data : 46, 22, 35, 26, 22, 53, 33, 42, 59   To find : Mean…

Q: The monthly income of 5,000 workers at the Microsoft plant are distributed normally. Suppose the…

A: (1) Determine the number of workers earn more than $1500 per month. The number of workers earn more…

Q: Assume that the hourly cost to operate a commercial airplane follows the normal distribution with a…

A: Consider X be a random variable which follows normal distribution indicates the operating cost of a…

Q: mean length of 25 cm. Because of the variability in the manufacturing​ process, the lengths of the…

A: Population mean μ =25 Population standard deviation =0.08

Q: Newborn babies: A study conducted by the Center for Population Economics at the University of…

A: Z = (x - u) /s u = mean = 3492 s = standard deviation = 872

Q: The mean number of hours per day spent watching television, according to a national survey, is 3.5…

A: From the provided information, Mean (µ) = 3.5 Standard deviation (σ) = 2

Q: The heights of 18 year old men are normally distributed with a mean of 67 inches and a standard…

A: Given information- Population mean, µ = 67 inches Population standard deviation, σ = 3 inches We…

Q: The playing life of a Sunshine radio has a Normal distribution with a mean of 600 hours and a…

A: The playing life of a radio is normally distributed with mean 600 hours and standard deviation of…

Q: The following data represent the number of people aged 25 to 64 years covered by health insurance…

A: GIven data is Age Number(millions) 25 - 34 22.8 35 - 44 30.4 45 - 54 39.4 55 - 64 27.7

Q: A sample of data is given as below:3, 5, 7. What is the standard deviation

A: The formula for sample standard deviation is,

Q: The playing life of a Sunshine radio has a Normal distribution with a mean of 600 hours and a…

A: The playing life of a radio is normally distributed with mean 600 hours and standard deviation of…

Q: As reported in Runner's World magazine, the times of the finishers in the New York City 10- km run…

A: Percentile : Percentile is the number such that certain percentage of the fall below that values.…

Q: The playing life of a Sunshine radio has a Normal distribution with a mean of 600 hours and a…

A: It is given that the mean is 600 and the standard deviation is 100.

Q: The age of student at a university are normally distributed with a mean of 20. What percentage of…

A:

Q: A company wants to assess the average time it takes for customers to complete a particular task on…

A: Answer:Sample Mean ():

Q: The ages of the members of a boating club is normally distributed with a mean of 62 years and a…

A: Given that, Mean = 62 Standard deviation = 12

Q: According to the Department of Education the mean number of hours college students spend studying…

A:

Q: The following data represent the number of people aged 25 to 64 years covered by health insurance…

A: Given data : Sr no classes Frequency 1 25-34 20.6 2 35-44 36.7 3 45-54 33.2 4…

Q: According to the Department of Education the mean number of hours college students spend studying…

A: Given, mean(μ)=28standard deviation(σ)=6 Let x=no.of hours of study