Let X be the life in hours of a radio tube. Assume that X is normally distributed with the mean 200 and variance o?. If a purchaser of such radio tubes requires that at least 90% of the tubes have lives exceeding 150 hours, what is the largest value o can be and still have the purchaser satisfied?

Q: Consider the variable x = time required for a college student to complete a standardized exam.…

A: The proportion of students at this university would be unable to finish in the allotted time when 50…

Q: Suppose that the readings on the thermometers are normally distributed with a mean of 0∘0∘ and a…

A:

Q: A "big-box" store sells a particular laptop, but has only four in stock. The manager wonders what…

A:

Q: Male and female populations of tortoises under 80 years old are represented by age in the table…

A: Here the given table is : Age males females…

Q: Suppose that a category of world class runners are known to run a marathon (26 miles) in an average…

A: The random variable X is the average of the 49 races. The mean is 142, and standard deviation is 13.…

Q: Suppose the scores, X, on a college entrance examination is normally distributed with mean 550 and a…

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

Q: An educational study to be conducted requires a test score in the middle 40% range. If the mean is…

A: Let us assume X=score Given that X follows a normal distribution with mean= 100 and standard…

Q: Suppose the mean resting heart rate of females aged 20 is mean = 61, standard deviation = 5…

A: The objective of this question is to compare the fitness levels of a 20-year-old female and a…

Q: Assume thAt scores on a standardized test are known to follow a bell shaped distribution with a mean…

A: L

Q: If on an average 8 ships out of 10 arrive safely at a port, find the mean and standard deviation of…

A:

Q: If X ~B(190,0.34), find mean and variance of x. (Rounded in 3dp.)

A: X ~B(190,0.34) Given a Binomial Distribution X ~B(n,p) Here, n = 190 , p = 0.34

Q: Class Interval Frequency Class Marks Class Boundarieelative Frequen CF 20-26 12 23 19.5-26.5 0.12 12…

A: Given : Class interval Frequency Class Mark Class Boundaries Relative frequency <CF >CF…

Q: Alex's times for running a mile are Normally distributed with a mean time of 5.28 minutes and a…

A:

Q: The score of individual student on a national test have a normal distribution with mean 18.6 and…

A:

Q: If the mean exam score of a class was 75%, with a standard deviation of 15%,what percent of students…

A: Given,mean(μ)=0.75standard deviation(σ)=0.15

Q: Suppose the rate of misprints in the printed text from a given publisher is three misprints per one…

A: The question is about discrete probability distribution.Introduction :1 ) Let, X be discrete random…

Q: suppose the income of workers at your job follows a normal distribution. if you standardisize their…

A:

Q: Suppose the distributions of arrival and service times were normal instead of exponential.  Let the…

A: The objective of this question is to estimate the long-run average number of people that would be in…

Q: The weights of bags filled by a machine are normally distributed with a standard deviation of 0.05…

A:

Q: Assume that the test scores for a large class are normally distributed with a mean of 64 and a…

A: Solution-: Given: We find P(the class received a higher score than 78)=?

Q: Total plasma volume is important in determining the required plasma component in blood replacement…

A: The sample size is 44, sample mean is 37.5 and population standard deviation is 7.50.

Q: Assume that z-scores are normally distributed with a mean of 0 and a standard deviation of 1. If…

A: P(-b<Z<b)=0.9706

Q: Male and female populations of to under 80 years old are represented by age in the table below.…

A: The question is about frequency distribution.Given :

Q: Suppose that the blood pressure of the human inhabitants of a certain Pacific island is distributed…

A:

Q: Find the mean and standard deviation of the waiting time for counter A and B.

A: The values for counter A are- 18, 21, 22, 23, 23, 24, 24, 25, 25, 25, 26, 30, 32, 34, 50 The values…

Q: Suppose the mean monthly return on a T-Bill is 0.5% with a standard deviation of 0.58%. Sup- pose we…

A:

Q: A standardized exam’s score are normally distributed. In a recent year, the mean test score was 1477…

A: Introduction: Consider X as a normally distributed random variable, with mean μ and standard…

Q: Suppose that the weights per bag of cement produced by a company follow a  normal distribution. The…

A:

Q: The frequency distribution table below is the net weight of a sample of candied fruit products in…

A: The frequency distribution table below is the net weight of a sample of candied fruit products in…

Q: Suppose the mean and standard deviation of the GPAs of all currently registered students at a…

A: Given data,Mean μ=2.70sd     σ=0.50Antionio’s z score = -0.62Beatrice’s z score = 1.28What are their…

Q: Suppose that you are designing an instrument panel for a large industrial machine. The machine…

A: Given that: Women's mean and standard deviation: μ=2.7σ=0.5 Men's mean and standard deviation:…

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.