The Mean and Standard Deviation of a series of 100 items were found to be 60 and 10 respectively. While calculating two items were wrongly taken as 5 and 45 instead of 30 and 20. Calculate correct variance and coefficient of variation.

Q: In measuring ignition duration, an engineer estimates that the standard deviation is 0.05 seconds.…

A: We have given that  Standard deviation = 0.05  Margin of error =E=0.01 95% confidence interval.

Q: Suppose that the readings on the thermometers are normally distributed with a mean of 0∘0∘ and a…

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Q: A random sample of 10 subjects have weights with a standard deviation of 11.7640 kg. What is the…

A: Given  A random sample of 10 subjects have weights with a standard deviation of 11.7640 kg.

Q: If the standard deviation for a population increases, the standard error for sample means from the…

A: The standard error is a statistical concept that tests the precision with which a sample…

Q: The mean and standard deviation of 200 items are found to be 60 and 20 respectively. If at the time…

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Q: Suppose a variable X is normally distributed with a standard deviation of 10. Given that .0985 of…

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Q: The mean and standard deviation of a set of 100 observations were Worked out as 40 and 5…

A: We have given that Number of observations(n)=100  Corrected mean=40 Standard deviation=5  Mistaken…

Q: A population has a standard deviation of σ = 18. On average, how much difference should exist…

A: Given data, σ = 18 n = 4   The standard error measures the distance expected on an average between…

Q: Suppose samples are taken from a population of heifers with known mean and standard deviation of…

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Q: The average monthly income of public school teachers is Php25,000 with standard deviation of Php800.…

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Q: The variance of a sample of 99 observations equals 81. The standard deviation of the sample equals?

A: From the provided information, The sample variance of 99 observations (s2) = 81

Q: The standard deviation and variance vary in a related way since one can be calculated from the…

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Q: Is it possible to obtain a negative value for the variance or standard deviation?

A: The variance and the standard deviation, which is the square root of the variance are the most…

Q: weighs 170 lbs with a standard deviation of 8 lbs and the average female tennis player weighs 125…

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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: it is known that the population standard deviation of weight among females is 30. assuming that we…

A: The standard error of the average weight among women of a sample of this size is obtained below:…

Q: The mean and standard deviations of 200 items are found to be 60 and 20 respectively . But at the…

A: Given No. of items = 200 Wrong mean, x¯=60Wrong sd, s=20Correct value=18,17Incorrect value=3, 67

Q: A population has a mean of 75 and a standard deviation of 15. If you randomly sample 9 people from…

A: Mean = 75 Standard deviation = 15 Sample size = 9

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

A: Let X be the readings on the thermometers which follows normal distribution with mean of 0°, and…

Q: If I have the variance of 36 and the standard deviation of 6, how do I calculate the range?

A: From the provided information, Variance (σ2) = 36 Standard deviation (σ) = 6

Q: A random sample of 10 subjects have weights with a standard deviation of 10.6705 KG. What is the…

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Q: A population is normally distributed and has a mean of 50 and a standard deviation of 5 If we…

A: As we know the empirical rule of 68 - 95 - 99.7 that is the percent value that are one, two or three…

Q: The mean and standard deviation of 20 items was found to be 10 and 2 respectively. Later it was…

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Q: The arithmetic mean and standard deviation of a series of 20 items were calculated by a student as…

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Q: The standard error of the mean will change among mutliple samples even if the standard deviation and…

A: The standard error of the sample mean is given as follows  SEM = σn

Q: the lifetime of washing machines is estimated to be 900 hours, how large a sample must be taken in…

A: The formula to compute sample size is,

Q: The variance of a sample of 81 observations is equal to  64, what is  the standard deviation?

A: We have to find standard deviation

Q: Based on daily measurements, Brenda's weight has a mean of 200 pounds with a standard deviation of…

A: We know that, Coefficient of variation = (SD/mean)*100 For Brenda Coefficient of variation =…

Q: In order to determine the time required to complete a chemical analysis, 25 observations were made;…

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Q: A normal distribution has a mean of 40 and a standard deviation of 5. 68% of the distribution can be…

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Q: The value of the standard deviation will always exceed that of the variance. TRUE OR FALSE

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Q: A population has a mean of μ = 100, a variance of σ2 = 9, and a standard deviation of σ = 3.  The…

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Q: The mean and standard deviation of 20 items was found to be 10 and 2, respectively. Later, it was…

A: Given that, the mean and standard deviation of 20 items was found to be 10 and 2 respectively. But,…

Q: How I can calculate the standard deviations of each of the two differentassets?

A: Standard deviation is the positive square root of the mean of the squares of the deviations of the…

Q: A professor has found that the grades on the Statistics Final are normally distributed…

A: The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ  are the mean…

Q: If the variance of a national accounting examination is 900, how large a sample is needed to…

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Q: The average team in the NBA will score 112 points per game with a standard deviation of 8 points.…

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Q: A student obtained the mean and standard deviation of 100 observations as 40 and 5 respectively. It…

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Q: it is known that the population standard deviation of weight among females is 30. assuming that we…

A: There is a direct relationship between the margin of error of the interval and the confidence level,…

Q: The arithmetic mean and standard deviation of a series of 20 items were calculated by a student as…

A: Given that, sample size =n =20 x¯=20, s=5 1. we know that, x¯=20, so, x¯=20⇒∑xn=20⇒∑x=20×20=400 2.…

Q: If standard deviation =9, the variance equal to 81 98 65 0000

A: According to the given information, we have Standard deviation = 9

Q: Suppose that the volume of sound generated by heavy machinery in a factory is normally distributed,…

A: Consider X be a random variable which follows normal distribution indicates volume of sound…

Q: In most cases, if you have the variance, how do you compute standard deviation?

A: We have the variance, how do you compute standard deviation.  We use here the formula of variance to…

Q: According to the best available data, the standard deviation of the times spent by students doing…

A: Obtain the minimum sample size required for the estimate. The minimum sample size required for the…

Q: Based from the record, the mean weight of the newborn babies is 4.8 lbs with a standard deviation of…

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Q: In order to have the standard error of the mean be 6, one from a would need to take a sample of size…

A: Given ,standard error=6Standard deviation (σ)=42

Q: If the standard deviation of the whole national accounting examination is 30 for this year, how…

A: Solution: From the given information, confidence level is 0.99, σ=0.30 and E=5.

Q: IF THE VARIANCE OF A POPULATION IS 0.75, THE STANDARD DEVIATION MUST BE?

A: It is an important part of statistics . It is widely used .

Q: The arithmetic mean and standard deviation of a series of 20 items were calculated by á/ student as…

A: