The length of time taken to complete a particular task on a construction site is found to be Normally distributed with mean 45 min and standard deviation 10 min. Calculate the probability that the task will take between 30 min and an hour. Give your answer to three decimal places. Answer:

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A: The given degrees of freedom is 20 and area is 0.95.

Q: )Listen The average life of a brand of automobile tires is 30,000 miles, with a standard deviation…

A: Here is given that, mean is 30000 and standard deviation is 2000. We will use z-standard normal…

Q: Find the raw score which corresponds to z=1.6?

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Q: Assume that the readings on the thermometers are normally distributed with a mean of 0° and standard…

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Q: that follow a Weibull distribution with m = 2 and a = 10 (with measurem of hours). e probability…

A: The random variable  represents the life lengthof resistors. The measurements in thousands of hours.…

Q: b. Find the probability that a randomly hit fly ball travels less than 330 feet. Round to 4 decimal…

A:

Q: Scores on a test have a mean of 6 and a standard deviation of 9. Michelle has a score of 57. Convert…

A:

Q: the data set has a size 50, how many observations lie within 2 standard deviations of the mean

A: From the provided information, Sample size (n) = 50 The observations lie within 2 standard…

Q: Assume that the readings on the thermometers are normally distributed with a mean of 0° and standard…

A: the PDF of normal distribution is = 1/σ * √2π * e ^ -(x-u)^2/ 2σ^2standard normal distribution is a…

Q: An ABC new report stated that the mean distance that commuters in the United States travel each way…

A: Given : μ = 16 , σ= 8 and n= 75

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A: Given Information: Speed (mph) Cars 30-39 7 40-49 16 50-59 51 60-69 16 70-79 10 To…

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A: Normal distribution is a continuous distribution which has so many real world applications. A sample…

Q: Find the indicated IQ score. The graph to the right depicts IQ scores of adults, and those scores…

A: GIVEN DATA, normal distribution μ=100σ=15we have to find out the indicated IQ score for the given…

Q: d. The degrees of freedom = e. The test-statistic for this data (Please show your answer to three…

A: d. Degrees of freedom: df=number of categories-1   =4-1   =3

Q: For a certain group of individuals, the average heart rate is 74 beats per minute. Assume the…

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Q: Approximately​ 95% of the observations fall within the interval

A: We have given that Mean(x̅) = 79.6 and Standard deviation (s) = 13.9

Q: To qualify for a medical study, an applicant must have a systolic blood pressure in the 50% of the…

A: Given data ,μ=120σ=3z-value at 50% confidence isz∝12=0.674

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: Scores on a test have a mean of 66 and a standard diviation of 9. Michelle has a score of 57.…

A: Given,          Mean μ=66          Standard deviationσ=9          Michelle has a score X=57

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

A: Given, IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. => μ…

Q: find the z score that corresponds to P35, P65, P20, P55, P67, and P25. Draw the normal curve and…

A: The question is about Std. normal distribution Introduction : 1 ) z is a std. normal r.v which…

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: Explain the statistics measure standard deviation. Provide the formulas used to calculate the…

A: We want to define standard deviations and difference between population standard deviations and…

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Q: A distribution of values is normal with a mean of 120 and a standard deviation of 4. Find the…

A: Let us denote X= the variable Given that X follows a normal distribution with mean=120 and standard…

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A: A parameter is a number representing the entire population. Usually sample statistics is used to…

Q: =CONFIDENCE.T (0.1, 3.533, 16

A: Given that  =CONFIDENCE.T (0.1, 3.533, 16)

Q: Assume that a randomly selected subject is given a bone density test. Bone density test scores are…

A: Sketch the normal curve and shade the area of 0.04 to the left of "z" under the normal curve. Refer…