Ages of Passenger Cars The average age of passenger train cars is  19.4 years. If the distribution of ages is normal and 5% of the cars are older than 22.8 years, find the standard deviation. Round z-value calculations to  2 decimal places and final answer to 2 decimal places.   The standard deviation must be      years.

Q: A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of…

A: Solution: Let X be the length of the steel rod. From the given information, X follows normal…

Q: A vending machine dispenses coffee into an eight-ounce cup. The amount of coffee dispensed into the…

A: Given standard deviation(σ)=0.03

Q: Use the normal distribution of heights of adult women, which has a mean of 164 centimeters and a…

A: Here, μ=164 and σ=4

Q: Find the standard deviation for the given data. Round your answer to one more decimal place than the…

A: Obtain mean of the sample data. Denote the values of the sample data by xi: xi: 223, 225, 300, 291,…

Q: Use the body temperatures, in degrees Fahrenheit, listed in the accompanying table. The range of the…

A:

Q: Data show that men between the ages of 20 and 29 in a general population have a mean height of 69.3…

A:

Q: According to the manufacturer, the lifetimes of a certain brand of all-season automobile tire have a…

A: The population mean is 81,123.

Q: A medical lab tested a sample of 8 vials of blood for acidity on the pH scale.  Use this data to…

A:

Q: A statistics professor gives a survey to each of the 100 students in an introductory statistics…

A: Obtain the population standard deviation:

Q: Cars on I-40 have a mean speed of 73 MPH at a certain mile marker, with a standard deviation of 8…

A: Let X = speed of the car. X~N73, 82 To calculate P[70<X<75]. So,…

Q: Use the difference scores (values - mean) below to calculate the population standard deviation.…

A: Given : Total number of elements in the population =N=9 Data is given as (values-mean)…

Q: for the data set a = [3,7,2,4,8,4,1,3] find the first three moments by direct calculation (not a…

A: Given the data set a=3,7,2,4,8,4,1,3 y0<x<2=4-2xyx<0, x>2=0

Q: We have provided simple data sets for you to practice the basics of finding a a. population mean. b.…

A: Solution: a. Let X be the random variable. The given data is 1, 2, 4, and 4

Q: Americans love ice cream .The annual per capita consumption of ice cream ,in pounds ,in the united…

A:

Q: bidcorp auction team's weekly mean income $1000 and the standard deviation of this team is $100 the…

A: The objective of this question is to find the percentage of the auction team's members who have an…

Q: Use the normal distribution of IQ scores, which has a mean of 110 and a standard deviation of 14,…

A: The mean is 110 and the standard deviation is 14.

Q: Recently, a random sample of 25-34 year olds was asked, "How much do you currently have in savings,…

A:

Q: We have provided simple data sets for you to practice the basics of finding a a. population mean. b.…

A: The given data is 2, 5, 0 and –1.

Q: Find the mean and standard deviation for the individualized instruction scores. Scores…

A: Solution-: We find the mean and standard deviation for given frequency distribution table

Q: he highway mileage (mpg) for a sample of 8 different models of a car company can be found below.…

A: Ans#- The highway mileage (mpg) for a sample of 8 different models of a car company can be found…

Q: (a) Find the 45h percentile of the lengths. th (b) Find the 76 percentile of the lengths.

A: (a) The 45th percentile of the lengths is, PX<x=0.45PX-μσ<x-47840=0.45Pz<x-47840=0.45 The…

Q: Use either your graphing calculator or Table A.2. Round to 4 decimal places if necessary. The birth…

A: Given: Population mean μ=7.46 Population standard deviation σ=1.8 Consider X be the random variable…

Q: highway mileage (mpg) for a sample of 8 different models of a car company can be found below. Find…

A: given data, sample size=8we have to find out the mean , median, mode and  standard deviation for the…

Q: The amount of caffeine in a sample of five-ounce servings of brewed coffee is shown in the…

A: Solution:  The frequency distribution for the data is  f Midpoint x xf 2 70.5 141 10 92.5 925…

Q: The ages (in years) of a random sample of shoppers at a gaming store are shown. Determine the range,…

A: We have to calculate some summary statistics for given data.

Q: The frequency distribution in the table represents the square footage of a random sample of 510…

A: Square FootageFrequency0 - 4996500 - 999181000 - 1499351500 - 19991232000 - 24991192500 - 2999773000…

Q: A data set has a mean of 70.7 and a standard deviation of 6.2. The score of 69, is how many standard…

A:

Q: A statistics professor asks each of the students in an introductory statistics lecture to fill out a…

A: I have provided the answers using Excel

Q: bidcorp auction team's weekly mean income $1000 and the standard deviation of this team is $100 the…

A: The objective of this question is to find the percentage of the auction team's members who have an…

Q: Using StatKey or other technology, find the following values for the above data. Click here to…

A: The given data is as follows: 78101114161922252930

Q: The length of human pregnancies from conception to birth varies according to a distribution that is…

A: Given mean =266 days standard deviation =16 days.

Q: We have provided simple data sets for you to practice the basics of finding a a. population mean. b.…

A:

Q: A statistics professor gives a survey to each of the 100 students in an introductory statistics…

A: Obtain the population standard deviation:

Q: Tally is interested in the fuel efficiency of her car. She computes how many miles per gallon her…

A: Given data, Miles per Gallon 28 36 56 64

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.