1-the standard deviation 2-the variance 3-the relative standard deviation

Q: The scores on a standardised test are normally distributed with a mean of 95 and standard deviation…

A: Let X denotes the scores on standardized test. Given that X follows N(mean = 95, SD = 20), then Z =…

Q: an exam score has a mean of 506 and a standard deviation of 100. What exam score corresponds to a…

A: μ  = 506 , σ = 100  Z~ N(0,1)

Q: Range = 38 Mean = 28.5555556 Variance = 147(253)/(300) Standard deviation = 12.27 ⠀ ⠀ 19, 40, 42, 7,…

A: Variance          Standard deviation

Q: What percent of data points fall in the range of z=-1.5 and z=1.5 standard deviations of the mean

A: From the provided information, The range is between z = -1.5 to z = 1.5

Q: Scores on a test have a mean of 86 and a standard deviation of 13. Jerrica has a score of 94.…

A:

Q: What percentage of the data will fall between 1 standard deviation below the mean and 2 standard…

A: P(-1<z<2)=?

Q: The salaries of a company's employees are normally distributed with mean 15000 and standard…

A:

Q: Suppose X~ N(4,2). What value of x is 1.5 standard deviations to the left of the mean?

A: X~N(μ=4, σ=2)We have to find value of X is 1.5 standard deviation to the left of the mean

Q: Suppose the mean resting heart rate of females aged 20 is mean = 61, standard deviation = 5…

A: The objective of this question is to compare the fitness levels of a 20-year-old female and a…

Q: A reading exam was conducted for 4thgrade children and 9thgrade children. The 4thgrade children have…

A: Given: For 4th grade children mean μ is 20 and standard deviation σ is 5. The mean of 9th grade…

Q: The scores on a mathematics exam have a mean of 71and a standard deviation of 8. Find the x-value…

A: Let X denote the scores on a mathematics exam and it follows normal distribution with mean of…

Q: uppose you have a data set of size of 26 with mean 50 and standard deviation 8. If u subtract 8 from…

A:

Q: The scores on a standardized test are normally distributed with a mean of 105 and standard deviation…

A:

Q: The scores on a standardized test are normally distributed with a mean of 95 and standard deviation…

A:

Q: The scores on a test are normally distributed with a mean of 110 and a standard deviation of 22.…

A: Let X be the random variable from Normal distribution with mean (μ) = 110 and standard deviation (σ)…

Q: The mean grade on a statistics exam is/M=82, the standard deviation is=12. What actual grade has a…

A: The normal distribution  in the center are generally denser and basically less denser at tails.…

Q: A data set has a mean of 40 and standard deviation of 8. -2 standard deviation = -1 standard…

A: From the provided information, Mean of the data set (µ) = 40 Standard deviation (σ) = 8 Using…

Q: If the scores on a test have a mean of 43 and standard deviation of 1.5, what is z score of 45?

A: In order to solve for the equivalent z score, we will use the z score formulaFormula:z =…

Q: Suppose that you have a X= 75 on an exam with Ú=70. Which standard deviation would give you a better…

A: Given : Suppose that you have a X= 75 on an exam with Ú=70

Q: The deaths attributed to UV radiation have a mean of 141.5 with a standard deviation of 92.1.…

A: Mean = 141.5 Standard deviation = 92.1 Raw score = 343

Q: How does the curve change when the standard deviation is the same and the mean changes?

A: The mean is the center of symmetry of a curve or normal density curve.

Q: In a population of exam scores, a score of X = 88 corresponds to z = 2 and a score of X = 79…

A: From the provided information, A score of X = 88 corresponds to z = 2 A score of X = 79 corresponds…

Q: Block 101 got a mean of 87.5 with a standard deviation of 3.2 while Block 102 got a mean of 85.1…

A:

Q: Suppose the exam average in a class is 82% with a standard deviation of 2. What proportion of…

A:

Q: ou find the standard deviation in the most easiest way?

A: The standard deviation is used to calculate the variability of the data set. It tells us about the…

Q: Ex 2\\ Calculate the Variance and Standard deviation for the following data X= 15, 10, 8, 4, 23, 25,…

A: We have to find standard deviation and variance of given data. Formulae required:  Variance=∑…

Q: How does one calculate the standard deviation?

A:

Q: Suppose that iQ scores have a bell shaped distribution with a mean of 103 and a standard devation of…

A: Given: μ=103 and σ=13.   Now, to find where the lowest 32% of IQ scores lie:PZ<z=0.32 Look for…

Q: If 3 standard deviations to the left of the mean gives you a value of 30 on the normal curve and 4…

A: 3 standard deviations to the left of the mean=30i.e and 4 standard deviations to the right of the…

Q: The blue, red, and yellow curves all have a mean of 0, while the green curve has a mean of -2. pra…

A:

Q: Round each z-score to the nearest hundredth. A data set has a mean of  x = 4079  and a standard…

A:

Q: ENG 342 fınal exam of last semester has a mean score of 78 and a standard deviation of 8. Sally's…

A: Given,mean(μ)=78standard deviation (σ)=8Z-Score=1.5

Q: The scores on a standardized test are normally distributed with a mean of 90 and standard deviation…

A: The test score is 0.6 standard deviations above the mean is obtained below: From the given…

Q: standardized test has a pop. mean of 152 and a standard deviation of 16. Jenny has a z score of…

A: Given that n=500, z=-0.56

Q: Listed in the data table are 1Q scores for a random sample of subjects with medium lead levels in…

A: Given : For high lead level  x̄2 = 89.731 s2 = 9.764 n2 = 11

Q: How standard deviation affects the power?

A: With increase in standard deviation, The observed point will be located far away from the mean.…

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

A:

Q: Suppose that men's mean heartrate is 78.3 beats per minute (bpm), and women's mean heartrate is 73.9…

A: Given:men's mean heartrate =78.3women's mean heartrate=73.9standard deviation for both =4.7  and…

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.