Suppose that a distribution of 300 items has mean 115 and standard deviation 4. Find the z-score of the item x = 121

Q: Suppose the population of IQ scores in the town or city where you live is bell-shaped, with a mean…

A: Solution-: Let, X= the population of IQ scores in the town Given: We find mean and standard…

Q: Suppose that a distribution of 400 items has mean 130 and standard deviation 5. Find the​ z-score of…

A: Given that.   X~N( μ , ?)   μ=130     , ?=5  , x=143   Z-score =( x - μ )/?

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: Assume that a set of test scores is normally distributed with a mean of 110 and a standard deviation…

A: Empirical rule of probability:- Approx. 99.7% of the data lies between ± 3 SD limit of mean μ  ±3 σ…

Q: If a set of data is normally distributed with a mean of 50 and a standard deviation of 5, a z-score…

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Q: Assume that the number of pieces per bag has a mean of 264 with a standard deviation of 3. use the…

A: Given :  the number of pieces per bag has a mean of , μ=264  a standard deviation of , σ =3   We…

Q: Assume that the number of pieces per bag has a mean of 72 with a standard deviation of 1.use the…

A: We have to find given probability by using emperical rule...

Q: The mean value of the scores in a Statistics exam was 85 with a standard deviation of 4. Find an…

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

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Q: The length of human pregnancies from conception to birth follows a bell shaped distribution with…

A: Given that  The distribution followed a bell shaped distribution. Mean (μ) =266 days Standard…

Q: A teacher says that the top 9​% of the class received an A on the last test. The scores were…

A: Given that the mean is 67 and the standard deviation is 18. That is, μ=67, σ=18 A teacher says that…

Q: A sample of 90 items has mean 55 and standard deviation 3. A second sample of 110 items has mean 60…

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Q: A normally distributed set of data has been generated where 50% of the data lies below 97 and 70%…

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Q: What is the corresponding z score, mean is 60, standard deviation is 8.1, X=72

A: We have to find z score.

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…

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Q: If the scores follow normal distribution with a mean of 120, a standard deviation of 10, find…

A: Solution

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

A: Given data, μ=35σ=12P(X>60)=?

Q: Use Chebyshev's Theorem to find what percent of the values will fall between 120 and 150 for a data…

A: The percentage of observations that are within k std dev. of the mean is 100(1-1k2)%

Q: for a population with a standard deviation of 5 and mean of 48, draw a bell shaped curve, marking…

A: Given data, Mean=48 sd=5 Draw a bell shaped curve?

Q: The phenomenal data shows that the average of a player is 41 runs and mean score of team is 50 with…

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Q: Suppose the scores of students on an exam are normally distributed with a mean of 337 and a standard…

A: Let X be the random variable from normal distribution with mean (μ) = 337 and standard deviation (σ)…

Q: for normal distribution mean is 100 and standard deviation is 15 use the emperican graph and gave 1…

A: Normal distributionμ=100σ=15we draw empherical graph

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: A set of data item is normally distributed with a mean 208 and a standard deviation of 48. Find the…

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Q: Assume that adults have IQ scores that are normally distributed with a mean of 100.3 and a standard…

A: Assume that adults have IQ scores that are normally distributed with a mean of 100.3 and a standard…

Q: Find the area of the shaded region. The graph to the right depicts scores of adults, and those…

A: normal distribution curve is given μ = 100σ = 15area shaded to the left of 120.

Q: Suppose that the scores on a statewide standardized test are normally distributed with a mean of 71…

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Q: What is the greatest amount of time that a newborn can sleep and still be in the bottom 75% of…

A: Let , X→N(μ=15.5 , σ=1.6) Our aim is to find the greatest amount of time that a newborn can sleep…

Q: Suppose the test scores in a class are normally distributed with a mean of 70 and a standard…

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: The IQ’s in a certain population are normally distributed with a mean score of 104 and a standard…

A: It is given that the scores follow normal distribution with mean 104 and standard deviation 14.…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 107 and a standard…

A:

Q: Assume that a set of test scores is normally distributed with a mean of 110 and a standard deviation…

A: Given: A set of test scores is normally distributed with a mean of 110 and a standard deviation of…

Q: for normal distribution mean is 100 and standard deviation is 20 use the emperican graph and gave 3…

A: We have to find normal distribution   mean  fall with 3 standard deviation values lower and upper…

Q: (a) between 56 and 74. % (b) above 68. % (c) below 56. %

A: here as per guideline i have calculated 3 subparts , plz repost for remainning. Suppose that the…

Q: Assume that an intelligence test scores are distributed normallt with a mean of 100 and a standard…

A: Standard normal distribution: The standard normal distribution is a special case of normal…

Q: Assume that the test scores for a large class are normally distributed with a mean of 64 and a…

A: Solution-: Given: We find P(the class received a higher score than 78)=?

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: Suppose that the score on a reading test are normally distributed within a mean of 70 and a standard…

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Q: The scores on a distribution have a normal distribution with mean 65. Suppose the third quartile…

A: It is given that the mean and third quartile of the normal distribution is 65 and 75 repectively.…