The life time (in days) of a certain electronic component that operates in a high-temperature environment is lognormally distributed with parameters mean=7.5 and standard deviation of 0.3. Find the 80th percentile of lifetime?

Q: The historical Average rainfall for Albany N,Y is 36.9 inches a year, with standard deviation of 4.3…

A: To test:H0:μ=36.9H1:μ>36.9

Q: On a recent quiz, the class mean was 77 with a standard deviation of 2. Calculate the z-score (to 2…

A: Solution-: Given: μ=77,σ=2,X=78 We want to find Z-score=?

Q: Suppose that replacement times for washing machines are normally distributed with a mean of μ= 8.7…

A: Let ,  random variable X be the replacement times for washing machines  The random variable X…

Q: random survey of 75 death row inmates revealed that the mean length of time on death row is 17.4…

A: # Given: sample mean=17.4  sample size n=75  standard deviations=6.9  population mean mu=15…

Q: The time to repair of an equipment follows a lognormal distribution with a MTTR of 2 hours and a…

A:

Q: The percent of fat calories that a person in America consumes each day is normally distributed with…

A: Let X denote the percent of fat calories that a person in America consumes each day is normally…

Q: An article reports measurements of the total power, on the log scale, of the heart rate variability,…

A: Let x denote the group of patients aged 25-49and y denote the group of patients aged 50-75The…

Q: The life of Sunshine CD players is normally distributed with a mean of 4.1 years and a standard…

A: Mean()=4.1standard deviation()=1.3Let "X" be the length of time a CD player lasts

Q: O a. E(X) = 0.333, SD(X) = 0.111 O b. E(X) = 0.333, SD(X) = 0.333 O c. E(X) = 3, SD(X) = 3 O d. NONE

A: Given :   λ = 3

Q: Scores on a test have a mean of 86 and a standard deviation of 13. Jerrica has a score of 94.…

A:

Q: A random sample of 46 adult coyotes in a region of northern Minnesota showed the average age to be x…

A: Given information- Sample size, n = 46 Sample mean, x-bar = 2.03 years Sample standard deviation, s…

Q: Q1: Lifetimes of a certain component are lognormally distributed with parameters p = 1 day and o =…

A: Given: μ = 1 and  σ= 0.5 The mean lifetime of these components is computed as, Mean=eμ+σ22…

Q: A random sample of 41 adult coyotes in a region of northern Minnesota showed the average age to be x…

A:

Q: Please calculate the thickness that 80.0 percent of the products thicknesses are thinner than or…

A: Given: Let X = thickness X is lognormally distributed with mean μ = 8.5 inches and standard…

Q: Suppose a variable is Normally distributed with μ=345 and \sigma σ=30. What proportion of the data…

A: Let X be the random variable from normal distribution with mean (μ) = 345 and standard deviation (σ)…

Q: Suppose the distribution of maximum monthly January temperatures in Sydney is normal with mean, μ =…

A:

Q: Let X represent the growth rate of Cardinals Fever in Saint Louis and let Y = 100, 000e ^ X be the…

A: X follows Normal Distribution with mean μ=0.4 and standard deviation σ=0.2.

Q: Suppose the distribution of maximum monthly January temperatures in Sydney is normal with mean, μ =…

A:

Q: Suppose that the life expectancy of a certain brand of nondefective light bulbs is normally​…

A: From the provided information,Mean (µ) = 1400Standard deviation (σ) = 100X~N (1400, 100)90,000 of…

Q: Adult men have heights with a mean of 69.0 inches and a standard deviation of 2.8 inches. Find the…

A: Given that  Adult men have heights with a mean of 69.0 inches and a standard deviation of 2.8…

Q: Assume that adults have IQ scores that are normally distributed with a mean of mu equals 105μ=105…

A: Solution: It is given that adults have IQ scores that are normally distributed with a mean of 105…

Q: The lifetime of a certain type of automobile tire (in thousands of miles) is normally distributed…

A: Given ,          Mean μ=40          Standard deviation σ=5

Q: The combined SAT scores for the students at a local high school are normally distributed with a mean…

A: Given data,μ=866σ=159P(X<862)=?

Q: The lifespan of a certain insect is believed to follow a normal distribution

A: Life span = X and follows normal with μ=98 and σ=7   We know that (x-μ)/σ follows N(0,1) so,…

Q: In a manufacturing industry, the amounts which go into raw materials(scraps) are supposed to be…

A:

Q: A random sample of adult female reaction times has a sample mean of x¯=394.3 milliseconds and sample…

A: We first find 140.5 is how many SD (standard deviation) away from the mean 394.3 So, 140.5 is 3SD…

Q: The antibody production of 12 male red-winged blackbirds before and after recelving testosterone…

A: It is given that margin of error (E) is 0.07 and the confidence level is 0.80.

Q: Chapt 4, Q8: Answer this question please The antibody production of 12 male red-winged blackbirds…

A: Given data: Standard deviation  = 0.240 Margin of error = 0.08 Confidence level = 80% (0.8) To find:…

Q: Bromomethane is degraded 8% in 14 days, when incubated with 30 mg/L of activated sludge in the…

A: To calculate the second-order biodegradation rate constant (k) for bromomethane, we can use the…

Q: Researchers are interested in estimating the prevalence of illegal drug use among teenagers aged…

A: Given n=55 P=0.40

Q: Let X represent the growth rate of Cardinals Fever in Saint Louis and let Y = 100,000e ^ X be the…

A: X follows Normal Distribution with mean μ=0.4 and standard deviation σ=0.2.To find the difference…

Q: Suppose the distribution of maximum monthly January temperatures in Canberra is normal with mean, μ…

A:

Q: mean of x = 2.882, standard deviation = 1.634  Mean of y = 2.588, standard deviation = 0.246 The…

A: Given that  mean of x = 2.882, standard deviation = 1.634    Mean of y = 2.588, standard deviation =…

Q: Forced expiratory volume (FEV) is an index of pulmonary function that measures the volume of air…

A: Given Information: Nonsmoking men: Mean μ=4.2 Standard deviation σ=0.5 Smoking men: Mean μ=3.2…

Q: Annual salaries in a large organization can be modeled as a lognormal variable with log (to the base…

A: Lognormal distribution:Lognormal distribution is a continuous probability distribution, in which the…

Q: Statistical information on the annual maxima (i.e., annual maximum floods) for a river is summarized…

A:

Q: The lifetime, in hours, of a head gasket of a cylinder in a car engine is distributed as lognormal…

A:

Q: A biology researcher is studying the risk of extinction of a rare tree species in a remote part of…

A: Solution

Q: In the manufacturing process of a pharmaceutical product, repeated measurements follow a Normal…

A:

Q: The scores on a test are normally distributed with a mean of 150 and a standard deviation of 30.…

A: The normal distribution:A continuous random variable X is said to follow normal distribution if the…

Q: Assume that adults have IQ scores that are normally distributed with a mean of mu equals 100μ=100…

A: The probability that a randomly selected adult has in IQ between 84 and 116 is obtained below:Let X…

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.