Suppose that from the past experience a professor knows that the test score of a student taking his final examination is a random variable with mean 60 and standard deviation 10. How many students would have to take the examination to ensure, with probability at least 0.94, that the class average

Q: In the second quarter of 2015, the average movie ticket cost $8.61. In a random sample of 50 movie…

A:

Q: Suppose the payment for tasks completed on a project is approximately normally distributed with a…

A:

Q: If n is multiplied by the factor k in the binomial distribution having the parameters n and p, what…

A: In question, Given that n is multiplied by the factor k in the binomial distribution having the…

Q: Suppose that, based on historical data, we believe that the annual percentage salary increases for…

A: Given Information: Mean μ= 12.2% = 0.122 Standard deviation σ = 3.6% = 0.036 Sample size (n) = 9 To…

Q: A manufacturer knows that their items have a normally distributed length, with a mean of 9.7 inches,…

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: For a random variable that is normally distributed, with a mean of 80 and standard deviation of…

A:

Q: For a random variable that is normally distributed, with mean of 80 and standard deviation of 10,…

A:

Q: Suppose that a population is known to be normally distributed with mean = 2,000 and standard…

A: GivenMean(μ)=2000stanadard deviation(σ)=230sample size(n)=16

Q: If a random sample of size 9 is drawn from a normally distributed population with mean 64 hours.…

A:

Q: A manufacturer knows that their items have a normally distributed length, with a mean of 10.6…

A: Obtain the Z-score for the random variable X equals 8.9. The Z-score for the random variable X…

Q: Suppose a population has a mean of 400 and a standard deviation of 24. If a random sample of size…

A: Given that, mean = 400 standard deviation =  24 n = 144

Q: Suppose the scores, on a college entrance examination are normally distributed with a mean of 1000…

A: We have given that Suppose the scores, on a college entrance examination are normally distributed…

Q: if X is normally distributed random variable with a mean of 80 and a standard deviation of 12, then…

A: GivenMean(μ)=80standard deviation(σ)=12

Q: A detergent company finds that a family in the country washes an average of 910 kilograms of clothes…

A: We have given that,  Let X be the random variable from normal distribution with mean (x̄) = 910 and…

Q: Suppose that the miles-per-gallon (mpg) rating of passenger cars is a normally distributed random…

A:

Q: Suppose a population has a mean of 400 and a standard deviation of 24. If a random sample of size…

A:

Q: 3. The average cholesterol content of a certain canned goods is 215 milligrams, and the standard…

A: Given that  X~N(μ= 215 , σ= 15 ) μ= 215 , σ= 15 , n= 25

Q: A detergent company finds that a family in the country washes an average of 910 kilograms of clothes…

A: Given that: X is normal Distributed with mean µ = 910.0 and standard deviation σ = 85.0 By using…

Q: Suppose it is known that a company completes a certain type of order in average of 48 minutes with a…

A: Let the associated random variable with type I and type II be X1 and X2 respectively. So, X̄1 ~…

Q: Suppose that the latest census indicates that for every 10 young people available to work only 4 are…

A: Solution: Let X represent the number of people are employed.  The probability of people are employed…

Q: Suppose in a certain primary school, the weight of boys are normally distributed with mean 28kg and…

A:

Q: A manufacturer knows that their items have a normally distributed length, with a mean of 19.4…

A:

Q: A manufacturer knows that their items have a normally distributed length, with a mean of 13.9…

A:

Q: A study at a college in the west coast reveals that, historically, 45% of their students are…

A: a) It is known that, the mean of the sampling distribution of sampling distribution, p-hat is equal…

Q: A sample of size 65 will be drawn from a population with mean 22 and standard deviation 15. Find the…

A: Given that sample size n=65Population mean μ=22Population standard deviation σ=15

Q: A manufacturer knows that their items have a normally distributed length, with a mean of 11.9…

A: Mean = 11.9 Standard deviation = 1.3

Q: Suppose it is known that the weight of a certain population of individuals are approximately…

A: Let, X=the weight of a certain population Given that X follows a normal distribution with mean=80…

Q: A new species of rabbit has an average body length of 45mm with a standard deviation of 3mm. In a…

A: Given that the new species of the rabbit has an average body of 45mm, which means the mean is 45mm…

Q: If X is a random variable with mean 5 and standard deviation 3, then the mean of the random variable…

A: The random variable is X.

Q: ). If a certain machine manufactures electrical resistors that have a mean resistance of 201.35 ohms…

A: Solution

Q: 9) For a certain type of computer, the length of time between charges of the battery is normally…

A:

Q: Suppose that we have a normal population with mean 7 and standard deviation 4.   What is the…

A: From the provided information, Mean (µ) = 7 Standard deviation (σ) = 4 Sample size (n) = 6

Q: A manufacturer knows that their items have a normally distributed length, with a mean of 12.4…

A: Mean = 12.4 Standard deviation = 1.7

Q: Suppose that, on average, electricians earn approximately µ = $54,000 per year in the United States.…

A: Obtain the standard Z-score for the random variable X equals 60,000. The standard Z-score for the…

Q: A population of widgets produced by a machine has weights with mean of 200mg and standard deviation…

A:

Q: Suppose that from the past experience a professor knows that the test score of a student taking his…

A: Here, µ=60, σ=10, E=1.5

Q: Suppose X is a normally distributed random variable with a mean of 9.00. If the probability that X…

A: Obtain the value of the standard deviation of X. The value of the standard deviation of X is…

Q: The television picture tubes of manufacturer A have a mean lifetime of 6.5 years and a standard…

A:

Q: Suppose that the starting salaries of MBAS at Wilfrid Laurier University (WLU) are normally…

A:

Q: Suppose x is a normally distributed random variable with a mean of 12 and a standard deviation of 3.…

A: Given,      Meanμ=12      Standard deviationσ=3

Q: Suppose that an airline uses a seat width of 16.7 in. Assume that men have hip breadths that are…

A: Mean = 14.2 Standard deviation = 1

Q: Suppose that weights of one-pound bags of apples follow the normal distribution with the mean of 1…

A: Given Population mean μ=1, standard deviations σ=0.2,  Let X be the weight of one pound bags off…

Q: Suppose that from the past experience a professor knows that the test score of a student taking his…

A: If a random variable X has a distribution with mean µ and standard deviation σ, then the Z-score is…

Q: From past experience, it is known that the number of tickets purchased by students standing in line…

A: Given μ=2.4σ=2.0

Q: Suppose the heights of 18 year old men are approximately normally distributed, with mean 71 inches…

A: The normal distribution is the most useful theoretical distribution for continuous variables. For…

Q: Suppose a set of 100 random numbers is normally distributed, with a mean of 50 and standard…

A: suppose a set of random numbers is normally distributed, with a mean of 50 and standard deviation 2.…

Q: Suppose that the average outstanding credit card balance for young professionals is 11,200 with a…

A: GIVEN DATA, μ=11200σ=2600If n=150P(X<12300)=?

Q: A manufacturer knows that their items have a lengths that are skewed right, with a mean of 11.2…

A:

Q: If a continous random variable, x, is normally distributed with a mean of 100 and a standard…

A: Given : X is normally distributed with a mean of 100 and a standard deviation of 15.

Q: If all possible samples of size 16 are drawn from a normal population with mean equal to 50 and…

A:

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.