The time taken to boil a kettle is normally  distributed with a mean of 94 seconds and  a standard deviation of 6 seconds. What  times do the middle 40% of boils fall between

Q: Salaries for teachers in a particular elementary school district are normally distributed with a…

A: The properties of the normal distribution is,   The Normal distribution curve is and bell shaped…

Q: A normally distributed data set has a mean of 0 and a standard deviation of 2. What is the percent…

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Q: Identify the data value corresponding to the indicated percentile. The amount of sleep an adult gets…

A: Let us define the random variable X as the amount of sleep an adult gets per day is normally…

Q: The distribution for the time a patient of a medical center spends waiting for an appointment is…

A: Solution: Let X be the time a patient of a medical center spends waiting for an appointment. From…

Q: what percent of the data falls within 2 standard deviations of the mean?

A:

Q: The ages of the members of a popular ski club is normally distributed with a mean of 46 years and a…

A: Given that the ages of the members of a popular ski club is normally distributed with a mean of 46…

Q: he mean length of one-year-old spotted flounder, in millimeters, is 124.8 with standard deviation of…

A: Given,μ=124.8σ=13.52P(X<x)=0.92x=?

Q: The height of trees in a nursery is normally distributed with a mean of 56.4 inches and a standard…

A: The height of trees in a nursery is normally distributed with a mean of 56.4 inches and a standard…

Q: A normally distributed data set has a mean of 0 and a standard deviation of 2. What is the percent…

A: Introduction: The fashionable regular distribution, additionally called the z-distribution, is a…

Q: If the main level of snowfall for Boston Massachusetts is 44 inches per year and the standard…

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Q: The temperature is recorded at 80 airports in the region. The average temperature is 65 degrees…

A: Solution

Q: Assume that family incomes are normally distributed with mean 30,000php and a standard deviation of…

A: Given :  Mean = 30000 Sd = 10000

Q: The mean rate for cable t.v.from a sample of 80 households was $29 per month with a standard…

A:

Q: Heights for 16-year-old boys are normally distributed with a mean of 68.3 in. and a standard…

A: Given information: μ=68.3, σ=2.9 The P-value for the 96th percentile = 0.96 Determine the z-score…

Q: Deforestation along the Sierra Madre mountains have been especially notorious. The average number of…

A: Given that.   X~N( μ , ?)   μ=4373    , ?=610   Z-score =( x - μ )/?

Q: Assume that women have heights that are normally distributed with a mean of 63.6 inches and a…

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Q: A researcher collects the distances between survey respondents and the closest grocery store. The…

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Q: Americans love ice cream .The annual per capita consumption of ice cream ,in pounds ,in the united…

A: It is given that the mean is 16.5 lbs and standard deviation is 2.5 lbs.

Q: The cruising altitudes for the fleet of one commercial airliner are normally distributed with a mean…

A: It is given that the mean is 34,950 and the standard deviation is 1,800.

Q: distribution of the height of a tomato plant is normal with population mean of 50 inches. The 80th…

A: Provided data is, distribution of the height of a tomato plant is normal with population mean of 50…

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 serum cholesterol level in men aged 18 to 74 are normally distributed with a mean of 178.1 and a…

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Q: In a standardized exam the mean score is 400 with a standard deviation of 50. Assume the scores…

A: Solution

Q: What proportion of skiers will finish the race in exactly one minute?

A: The tume it takes for downhill skiers to finish a race follows a Normal distribution with a mean of…

Q: Find the standard deviation if the mean = 2, mode = 5, variance = 56 . Round your answer to three…

A: We have given that,  Mean (x̄) = 2 , mode (z) = 5 and variance        (s^2) = 56 Then,  We will find…

Q: The heights of women are approximately Normal with mean 63.7 inchs and standard deviation 2.5…

A: Given information For Women Mean (µ1) = 63.7 inches Standard deviation (σ1) = 2.5 inches For men…

Q: Each year students in a local school district write a national examination. The average on this…

A: Average of a dataset is the mean value of the observations in the data and it is computed by…

Q: A standardized test has a pop. mean of 152 and a standard deviation of 16. Molly scores at the 91st…

A:

Q: The duration of human pregnancies are normally distributed with a mean of 267 days and a standard…

A: X follows a Normal distribution with mean = 267 and S.D = 16 Then z=(x-mean)/SD = (x-267)/16…

Q: How high must a 2016 Vehicles gas mileage be to fall in the top 15% of all vehicles? normal mean is…

A: Given information: normal mean is 23.0mpg standard deviation is 4.9mpg

Q: Write the steps of calculating the population standard deviation.

A: Standard deviation: The standard deviation is based on how much each observation deviates from a…

Q: Define "Standard Deviation" and also Find out the Standard Deviation of the given data: 86, 37, 21,…

A: Definition: Standard deviation is a measure of the amount of variation or dispersion of a set of…

Q: 95% of 80 night students scored between 70% and 80% on a quiz. If this data is normally distributed,…

A: Given: Total number of students n=80.             let X  denote the marks of students then,  X ~N(µ,…