Suppose that the life expectancy of a certain brand of nondefective light bulbs is normally distributed, with a mean life of 1300 hr and a standard deviation of 100 hr. If 60,000 of these bulbs are produced, how many can be expected to last at least 1300 hr? Click here to view page 1 of the table. Click here to view page 2 of the table.

Q: Suppose that a company makes light bulbs with a mean life of 310 hours, and a standard deviation of…

A: Given,  Mean μ = 310 Standard deviation σ = 47 Let x be hours a light bulb last

Q: The data set has size 60. Approximately how many observations lie within three standard deviations…

A: From the empirical rule

Q: You calculate that the standard deviation of a set of observation is 0. This tells you that.....?

A: The standard deviation measures the deviation of data points from mean. Its formula involves the sum…

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

A: Given data,Mean μ=1200sd    σ=50If n=30000P(1130<X<1260)=?

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

A: Given that the life expectancy of non defective light bulbs follows normally dist with mean 1200 hr…

Q: The reading speed of second grade students in a large city is approximately normal, with a mean of…

A: we have given that mu=90 ,sigma=10 and sample size n=10  Z-score =(x-mu)/sigma X~N(mu, sigma^2)

Q: Suppose the average amount of apples per tree in a large orchard is 600 pounds with a standard…

A: Given, Population mean µx=600 pounds Population standard deviation σx=70 pounds a. Assuming that the…

Q: A factory produces LED bulbs with an average lifespan of 50,000 hours and a standard deviation of…

A: The top 10% of bulbs last for at least how long is obtained below:From the given information, the…

Q: If there is a small amount of variation, then the standard deviation is what

A: Standard deviation: It is defined as the positive square root of the variance. It fulfils requisites…

Q: Suppose that the annual rainfall in Ferndale, California, is known to be normally distributed, with…

A: P(X>x)=2.1% x=?

Q: If the mean height of bonsai trees is 52 cm with a standard deviation of 10 cm, 95% of the trees are…

A: NOTE : As per our guidelines we have to answer the first question if multiple questions are posted…

Q: After surveying 625 potential voters polled, you find out that 325 support candidate X and 300…

A: Given information: A total sample of 625 potential voters. 325 out of 625 support candidate X. 300…

Q: The weights of 1,000 children average 50kg and the standard deviation is 5kg. How many children…

A: Given  mu=50, sigma=sd=5, n=1000 We want to find How many children weigh between 40kg and 55 kg?

Q: An engineer wishes to determine the width of a particular electronic component. If she knows that…

A: Given information,             Standard deviation (σ) = 2.9             Error (E) = 0.4 To know how…

Q: An engineer wishes to determine the width of a particular electronic component. If she knows that…

A:

Q: A student learns that on his most recent exam in psychology, the sample mean was 72.19 with a…

A:

Q: Here are the number of hours that each of a group of students studied for this exam: 2 4 22 2 1 4 1…

A: Solution Number of samples (n) = 10 Let "X" be the number of hours that each of a group of students…

Q: Suppose a probability and statistics class took an exam that had a mean of 60 and a standard…

A: Given, E(X)=60 SD(X)=12   After 10 Point curve Let Y be new variable.

Q: If the standard deviation of a data is 14.50 and if each value of the data is decreased by 5, then…

A: Given : Old standard deviation = 14.50

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 12.3…

A: Given that  The data that life span of a product is normally distributed. Mean (μ) = 12.3 years.…

Q: A set of data is found to have a sample standard deviation of 25. Suppose 9 were added to each of…

A: Given: s=25 9 is added to each of the values.

Q: A large normally distributed population has a mean of 502 and a standard deviation of 25. If the…

A:

Q: According to geologists, the San Francisco Bay Area experiences six earthquakes with a magnitude of…

A: Six earthquake every 100 years

Q: Suppose that the mean IQ in the United States is roughly100 and the standard deviation is 15 points.…

A: Given: Meanμ=100Standard deviationσ=15 Consider, X be the random variable that follows the normal…

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 11.6…

A: Solution: Let X be the lifespan. From the given information, X follows normal distribution with a…

Q: The distance traveled by a commuter in the city, has a mean of 28 miles and a standard deviation of…

A: Given,mean(μ)=28standard deviation(σ)=6sample size(n)=500

Q: An mechanic wishes to determine the length of the typical battery cable. If he knows that the…

A: Given: Standard deviation =3.7 E=0.30 95% confidence interval =1.96 Determine the number of cables…

Q: A manufacturing company wants to know if the product waste that they produce complies with the…

A: Given information Sample mean x̅ = 188 kg Population mean µ = 200 kg Sample size = 30 Standard…

Q: is 6% is your standard deviation?

A: Given according to question Sample size(N)=? Confidence =95% Margin of error = 5% Now question says…

Q: The data set has size 90. Approximately how many observations lie within two standard deviations…

A: The Empirical Rule states that 99.7% of data observed following a normal distribution lies within 3…

Q: If the standard deviation of a data set was originally 5, and if each value in the data set was…

A: Given that  The Standard deviation is 5

Q: The data set has size 40. Approximately how many observations lie within two standard deviations to…

A: 68-95-99.7-rule: Let X be an observation from a normal distribution, having mean µ and standard…

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

A:

Q: A nutritionist claims that the mean tuna consumption by a person is 3.3 pounds per year. A sample of…

A: (a) Let μ denotes the population mean tuna consumption. The claim of the test is that the mean tuna…

Q: A given set of data has a specific standard deviation. Describe what will happen to the standard…

A: Answer: The standard deviation of new data is remains same as original data. As a general rule, the…

Q: Suppose that the annual rainfall in Ferndale, California, is known to be normally distributed, with…

A: We have given that  X~N( mu , sigma^2) mu=35.5  ,sigma = 2.5 Z-socre =(x-mu)/sigma

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

A:

Q: Both sets of values have an average of 13.  Is Set A's standard deviation smaller, larger, or about…

A: deviations from mean are more for set A 1-13, 2-13, 3-13, 23-13, 24-13, 25-13, -12, -11, -10, 11, 12…

Q: If the mean is 8.35, and the standard deviation is 2.5, what will be the answer to this? How many…

A:

Q: A medical statistician wants to estimate the average weight loss of people who are on a new diet…

A: Solution: Given information: σ= 10  Population standard deviation E= 2 Margin of error C= 0.9=90%…

Q: The following data give the speeds (in kilometer) as measured by radar of 5 selected cars traveled…

A: The data shows the speeds (in kilometer) as measured by radar of 5 selected cars traveled at NLEX.

Q: Suppose that the annual rainfall in Ferndale, California, is known to be normally distributed, with…

A: Given data Mean μ = 35.5 inches Standard deviation ? = 2.5 inches For top 2.8% P (Z >z) = 0.028 P…

Q: The shape of the distribution of the time required to get an oil change at a 15-minute oil-change…

A: a) Central Limit Theorem for mean: If a random sample of size n is taken from a population having…

Q: A population has a mean of u=50 and a standard deviation of 0=10. If 3 points were added to every…

A: The properties of mean are:E(X + a) = E( X ) + a * E(X+a)=E(X)+aE(aX)=aE(X)The property of variance…

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 10.5…

A: Let us consider the X be a random variable which denotes the lifespan of items and it given that the…

Q: A nutritionist claims that the mean tuna consumption by a person is 3.5 pounds per year. A sample of…

A: (a) Let μ is defined as the population mean tuna consumption by a person. The claim of the test is…

Q: The data set has size 80. Approximately how many observations lie within two standard deviations to…

A: Empirical rule: On a normal distribution about 68% of data will be within one standard deviation of…

Q: Find the standard deviation for this data set. if a one goal hockey game was added to this data set,…

A: From the plot representing the number of goals scored per game, there are three games in which three…

Q: If the standard deviation of a sample is 4.3 for 28 data values, what would the standard deviation…

A: