Suppose that the scores on a statewide standardized test are normally distributed with a mean of 69 and a standard deviation of 4. Estimate the percentage of scores that were (a) between 57 and 81. % (b) above 73. % (c) below 57. % (d) between 65 and 81.

Q: From sample sizes of 36 adults find the proportion of sample means having values of at least 170.

A: Here Given  Sample size=n=36  Population mean=μ=162 Population SD=σ= 58

Q: What is the maximum blood pressure reading of the lowest 70% of adult males?

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Q: Suppose that the weights of candy bars vary according to a normal distribution, with mean of 62…

A: The question is about normal dist. Given : The mean weights of candy bars ( μ ) = 62 g The std.…

Q: The gestation period for human births can be taken as normally distributed with a mean of 256 days…

A:

Q: A​ half-century ago, the mean height of women in a particular country in their 20s was 63.8 inches.…

A: Given data,μ=63.8σ=2.51If n=28P(X≥65.08)=?

Q: The scores of the students in the final examination in Advanced Algebra are normally distributed…

A:

Q: Suppose you have a test with a mean of 66 and a standard deviation of 5. If you first increase…

A: Given Mean =66 Standard deviation=5

Q: Suppose that the scores on a reading ability test are normally distributed with a mean of  60  and…

A:

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

A:

Q: Suppose the distribution of maximum monthly January temperatures in Sydney is normal with mean, μ =…

A:

Q: Suppose the scores of students on an exam are normally distributed with a mean of 264 and a standard…

A:

Q: heights of adult women in the United States are normally distributed with a mean of 65 inches and a…

A: The z score can be calculated as: z=x-μσ The required z score that is associated with the top 10% or…

Q: 2. The mean height of the grade nine students at a certain high school is 164 centimeters and the…

A: The random variable height follows normal distribution. We have to find the probability of the…

Q: The average hours of sleep on a weeknight was 6.9 hours with a standard deviation of 1.5 hours. What…

A: Given Let X : The average hours of sleep on a weeknight mean = μ= 6.9  standard deviation = σ= 1.5…

Q: Based on the records of the Admissions Office of University X, the mean score of all Grade 11…

A:

Q: at a company, the data set containing the ages of aplicants for a particular job was normally…

A: The mean is 30 years and the standard deviation is 3.5 years.

Q: Assume that the time a student stays in school is normally distributed with a mean of 5 hours and a…

A: Given: μ=5 and σ=0.5.   The z-score is calculated asz=x-μσ

Q: For woman at Hartford college, times to run 400 meters are normally distributed with a mean of 85…

A: Solution: Let X be the time to run 400 meters. From the given information, X follows normal…

Q: The principal decided that the top 30% of the class with the highest grades in statistics will be…

A:

Q: Suppose that wedding costs in the Caribbean are normally distributed with a mean of $6000 and a…

A: Note: Hey as per our honor code i can answer only three sub parts. Thanx

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: Suppose you know that the distribution of sample proportions of nonresidents in samples of 200…

A: Let p^ denotes the sample proportion which follows normal distribution with mean 0.46 and standard…

Q: Suppose that, for a certain exam, a teacher grades on a curve. It is known that the mean is 65…

A: Given data: Mean μ=65 standard deviation σ=5

Q: The distribution of scores on the SAT is approximately normal with a mean of μ = 500 and a standard…

A: Given : The distribution of scores on the SAT is approximately normal with a mean of μ = 500 and a…

Q: Suppose the mean blood glucose of a population of adults is 162 with a standard deviation of 58.…

A:

Q: If the mean score on the final exam is 70 with a standard deviation of 10 then the test score of a…

A: Given Mean =70 Standard deviations=10 Z=-1.5

Q: Suppose the scores of students on a Statistics course are Normally distributed with a mean of 440…

A:

Q: Suppose on a chicken farm a random sample of 30 chickens were selected. The mean weight of the 30…

A: Given Data: μ=5.8σ=0.085   We know that X¯~ Normal μ, σ2n

Q: Assume that the heights of American men are normally distributed with a mean of 69.1 inches and a…

A: We have give that the height of American man are normally distributed with a mean of 69.1 inches and…

Q: The score on a test have a mean of 100 and standard deviation of 15. If a personnel manager wishes…

A: From the given information we find the cut off score.

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A:

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: Suppose that the mean and standard deviation of the scores on a statistics exam are 81.7 and 6.75,…

A:

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

A:

Q: A manufacturer of calculator batrries claims that the mean length of life for its battry is 500…

A:

Q: In a particular city, the weight of newly born babies is normally distributed with a standard…

A:

Q: The prices of all college textbooks follow a bell-shaped distribution with a mean of $108 and a…

A: HERE GIVEN FOR BELL SHAPED DISTRIBUTION  MEAN=$108 S.D=$21

Q: Assume that human body temperatures are normally distributed with a mean of 98.23 degrees Upper F…

A: Step-by-step procedure to obtain the percentage using MINITAB:Choose Graph > Probability…

Q: Assume that human body temperatures are normally distributed with a mean of 98.23 degrees Upper F…

A: It is given that human body temperatures follows normal distribution with mean of 98.23 and standard…

Q: Suppose that the daily viewing time is normally distributed with a mean of is 8.35 hours and a…

A: Determine the number of hours of television viewing must a household have in order to be in the top…

Q: Suppose that the distance of fly balls hit to the outfield is normally distributed with a mean of…

A: Let X denote the distance of fly balls hit to the outfield is normally distributed with a mean of…

Q: Assume that the number of pieces per bag has a mean of 78 with a standard deviation of 1. use the…

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Q: The distribution of scores on the SAT is approximately normal with a mean of µ = 500 and a standard…

A:

Q: Suppose the midterm exam score for 100 students at UPC had a mean of 70 and a standard deviation of…

A:

Q: If the weight of fertilizer in a 40-pound bag is normally distributed with a standard deviation of…

A: Define  the Random Variable, X : Weight of fertilizer in the bag. X ~ N(40,0.52) Hence , the mean, µ…

Q: A set of laptop prices are normally distributed with a mean of $750 and a standard deviation of $60.…

A: To Determine: A set of laptop prices are normally distributed with a mean of $750 and a standard…

Q: imagine the average score on an exam is 71 with a standard deviation of 10. If scores are normally…

A: If a random variable x has a distribution with mean µ and standard deviation σ, then the z-score is…

Q: Suppose that the mean IQ score for University Students is 105, with a standard deviation of 7.…

A: Normal distribution is a continuous distribution which has many real life applications. Normal curve…