An electrical firm manufactures light bulbs that have a length of life that is normally distributed with mean equal to 818 hours and a standard deviation of 43 hours. Find the probability that a bulb burns between 782 and 871 hours. (Write your final answer in decimal form, and round off to 4 decimal places.)

Q: ample of 3000 persons were surveyed for their walght in pounds, the mean weight is 135 lbs with a…

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Q: si fi 4 6 8 7 11 4 O A) 2,78 B) 7,29 OC) 3,32 D) 59,61 O E) 7,72

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Q: The life of light bulbs is distributed normally. The standard deviation of the lifetime is 25 hours…

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

A: Given information-We have given that adults have IQ scores that are normally distributed.μ= 105σ =…

Q: The chloride concentration in the blood (mmol / liter) averages 104 with a standard deviation of 5.…

A: Given Data: Let X represent the random variable   X~ Normal (104, 52) n=200 Therefore, X¯ ~ Normal…

Q: Assume that adults have IQ scores that are normally distributed with a mean of u = 105 and a…

A: Obtain the Z-score for the random variable X equals 129. The Z-score for the random variable X…

Q: Tossing Coins Find the mean, variance, and standard deviation for the number of heads when 19 coins…

A: Let X be the number of heads and n be the number of coins tossed.

Q: GET THE STANDARD DEVIATION

A: We have  intervals of age group as, .The sample mean for  age group. The total sample mean, =2.20.

Q: Temperatures in a city are distributed approximately normal, with a mean of 69 degrees Fahrenheit…

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Q: Assume that adults have IQ scores that are normally distributed with a mean of u = 105 and a…

A: Let "X" be the IQ score of adults.

Q: William revealed that he makes 1,000,000 dollars annually. The average annual income in the country…

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Q: Find the mean, variance and standard deviation. round all answers to on decimal place.

A: The mean of the variable X obtained as given below: Here, X denote the observation.

Q: The life of light bulbs is distributed normally. The standard deviation of the lifetime is 15 hours…

A: The mean is 590 hours and the standard deviation is 15. The life of light bulbs(X) is distributed…

Q: The life of light bulbs is distributed normally. The standard deviation of the lifetime is 20 hours…

A: Denote X as the life of a randomly selected light bulb.

Q: 5. 2.1, 4.6, 8.2, 3.4, 5.6, 8.0, 9.4, 12.2, 56.1, 78.2

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Q: Find the mean, variance and standard deviation. round all answers to on decimal place.

A: Solution: Suppose two dice rolled. Then, the sample space is Let X be the sum shown on the two…

Q: The life of lightbulbs is distributed normally. The standard deviation of the lifetime is 20 hours…

A: The following information has been provided: The population mean is μ=600. The population standard…

Q: o these calculations using Excel, a graphing calculator, or an app. Type the data in different…

A: The number of observations is 6.

Q: Assume that adults have IQ scores that are normally distributed with a mean of u = 105 and a…

A: Given information Mean µ = 105 Standard Deviation σ = 15

Q: Assume that adults have IQ scores that are normally distributed with a mean of u = 100 and a…

A: Let X be the random variable from normal distribution with mean (μ) = 100 and standard deviation (σ)…

Q: The amount of snowfall falling in a certain mountain range is normally distributed with a mean of 80…

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Q: Juan makes a measurement in a chemistry laboratory and records the result in his lab report. The…

A: The standard deviation of students lab measurements is 8. Juan repeats the measurement 2 times. That…

Q: If you buy one ticket everyday for 365 days, find the mean and standard deviation for the numbers of…

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

A: Mean()=105standard deviation()=15

Q: IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. Find the…

A: Reviewing information, Given, X : Individual's IQ score X~N(μ=100 , σ=15)

Q: As an electrical engineer, you have designed a new efficient light bulb. In order to predict its…

A: Formula  Used: Mean X = ∑FX∑F Standard deviation = ∑FX2-nX2∑F-1

Q: Find the mean, variance and standard deviation. round all answers to on decimal place.

A:

Q: Calculate the mean if -2 standard deviation = 70 and +2 standard deviation = 100. The mean of the…

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Q: The life of light bulbs is distributed normally. The standard deviation of the lifetime is 25 hours…

A: GivenMean(μ)=510standard deviation(σ)=25

Q: Assume that adults have IQ scores that are normally distributed with a mean of u 105 and a standard…

A: Given that, Mean = 105 and Standard deviation = 15

Q: Karen scored a 76 on an exam whose mean is 74 and whose standard deviation is 8. Find her z score.

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