The amount of water consumed each week by Bronx residences is normally distributed. The population mean of water consumption is 120.3 gallons with a standard deviation of 10.0 gallons. Test the claim at the 0.10 significance level that the average amount of water consumed is not 125 gallons with a sample size of 100 residences.     What is the probability of Z OBT?

Q: The probability that a person has immunity to a particular disease is 0.6. Find the mean number who…

A:

Q: The cost of unleaded gasoline in the Bay Area once followed (approximately) a normal distribution…

A:

Q: C. A manufacturing company firm produces LED lamps with a mean lifetime of 900 hours and a  standard…

A: Sample distribution of sample Mean (x¯) :  Suppose simple random sample of size ‘n’ is drawn form…

Q: The weight of small dogs can be modelled by a normal distribution with a mean weight of 8.4 kg and a…

A: The provided information is:

Q: The SAT and ACT college entrance exams are taken by thousands of students each year. The scores on…

A: (a) Obtain the percent of students would score less than 550 in a typical year. The percent of…

Q: The time it takes a computer repair company to diagnose a computer follows a normal distribution…

A: Given data  X = time taken for computer repair company to diagnose a computer μ=50   σ=12…

Q: Suppose z is a normal random variable. If you need to find P ( Z > 1.84 ), explain how to shade the…

A: The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ, where µ and σ are the mean…

Q: The average income in the city of Red Deer is $85,000 with a standard deviation of $20,000.  A…

A: It is given that the mean is $85,000 and the standard deviation is $20,000.

Q: he results of a statistics examination follow an approximately normal distribution with a mean of 68…

A: Given data,Mean μ=68Variance σ2=64sd     σ=8P(X>82)=?

Q: The results of a statistics examination follow an approximate normal distribution with a mean of 68…

A: Given Data Population Mean,μ = 68.0 Population Standard Deviation,σ = √64 =  8.0

Q: It is estimated that the weight of a box of cereal follows a normal distribution with a mean of 23.8…

A: From the given information,   Mean = 23.8 Standard deviation = 2.2   The objective is to find the…

Q: The volumes of soda in quart soda bottles are normally distributed with a mean of 32.3 oz and a…

A: μ=32.3, σ=1.2

Q: The results of a statistics examination follow an approximate normal distribution with a mean of 68…

A:

Q: The amount of daily sales of a candy shop in weekdays is approximately normally distributed with a…

A: Let us denote: X=the amount of daily sales of a candy shop in weekdays Given that X follows a normal…

Q: Find the 2525 -th percentile for the standard normal random variable ZZ

A: For aa standard normal variable, mean is 0 and standard deviation is 1.

Q: The daily sales of a small retail store in Toronto for the last 365 days are normally distributed…

A:

Q: The tread life of Stone Soup tires can be modeled by a normal distribution with a mean of 35,000…

A: Given: Population mean = 35000 Population standard deviation  = 4000     Sample size (n) = 100 Let X…

Q: The tread life of a particular brand of tire is a random variable best described by a normal…

A: Let X be the tread life of a particular brand of tire follows normal distribution with mean of…

Q: The fill volume of an automated filling machine used for filling soda cans is normally distributed…

A: given data, normla distribution μ=8.4σ=0.1we have to find out the given probabilties

Q: suppose the walking step lengths of an adult males are normally distributed with a mean of 2.7 feet…

A: Given that  Mean=μ=2.7 Standard deviation=σ=0.3 Sample size=n=70 X~Normal(μ=2.7,σ=0.3)

Q: The amount of weight on an ACME tractor trailer is known to have a normal distribution with mean 9.5…

A:

Q: Find the 42 -th percentile for the standard normal random variable Z

A: Solution Using standard normal table , P(Z < z) = 42% P(Z < z) = 0.42

Q: In 2014, the Cdc estimated that the mean height for adult women in the United states was 64 inches…

A: It is provided that the mean height for adult women in the united states was 64 inches with a…

Q: The heights of strawberry plants are Normally distributed with a mean of 12 inches and a standard…

A: The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ are the mean…

Q: 1. Find the z-score of x = 21 (Round your answer to 2 decimal places). Such a z-score is z | 2. Find…

A: Given that mean=μ=25 and standard deviation=σ=3.1Given x=21So the z score is:z=x-μσz=21-253.1z=−1.29

Q: The drainage from a community during a storm is a normal random variable.  The estimated mean flow…

A: Given data, μ=1.7σ=0.25P(X≤1.9)=?

Q: The tread life of a particular brand of tire is a random variable best described by a normal…

A: Given,          Meanμ =60,000          standard deviation σ=28

Q: The weights of the guinea pigs in a laboratory are normally distributed with a mean weight of 2.1…

A: Suppose the random variable X defines the weights of the guinea pigs.

Q: A machine produces glass with a nominal thickness of 4mm. In fact the thickness is a Normal random…

A: Given,mean(μ)=4.168 mmstandard deviation(σ)=0.12mm

Q: A manufacturing company measures the weight of boxes before shipping them to the customers. If the…

A: Given, µ=90 σ=24 n=36

Q: The tread life of a particular brand of tire is a random variable best described by a normal…

A: The random variable X is the tread life of a particular brand of tire It is normally distributed.…

Q: The results of a statistics examination follow an approximate normal distribution with a mean of 68…

A: Given : The results of a statistics examination follow an approximate normal distribution with a…