In a chemistry general exam, the grades are approximately Normally distributed with mean 77 and standard deviation 6 then #If Students don’t pass chemistry if their grade falls below 62 then the proportion of all students fail in chemistry is 0.0047 0.0228 0.0062 None

Q: Scores on the SAT are normally distributed with a mean of 500 and a standard deviation of 100. What…

A: The normal distribution is the most useful theoretical distribution for continuous variables.…

Q: What is the corresponding Z- score, mean is 110, standard deviation is 8 and x is 90

A: In question, We'll find the Z - score for mean 110, standard deviation 8 and x = 90. The solution is…

Q: a division wide aptitude test in mathematics was conducted to 1000 students. the mean of the test is…

A: Given : No. of students : Sample size (n) = 1000 Let X : Scores in aptitude test in mathematics…

Q: Scores for a standardized test are normally distributed with a mean of 1200 and a standard…

A: given data μ = 1200σ = 60 normal distributionn = 64P(1200<x¯<1214) = ?

Q: College students average 7.8 hours of sleep per night with a standard deviation of 40 minutes. If…

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Q: A distribution consists of three requencies 250, 300, 350 having neans 30, 15 and 20 and standard…

A: We have given that  Size N1=250 , N2=300, N3=350 Sample mean xbar1 =30 , x2=15 , x3=20 Standard…

Q: Management at a video game store wants to gain a better understanding of their customers. In order…

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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: 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: College students average 7.4 hours of sleep per night with a standard deviation of 45 minutes. If…

A: Given data  college students average 7.4 hrs of sleep with standard deviation of 45mins

Q: Approximately what percentage of normally distributed data values will fall within 2 standard…

A: It is known that, normal curve is a symmetric and bell shaped distribution.

Q: A normal distribution has a mean of 175 and a standard deviation of 38. What percent of observations…

A: Given that A Normal distribution has Mean (μ) = 175 Standard deviation (σ) = 38   We know that Z =…

Q: Samples of size n=4000 are randomly selected from a population of homeowners in Florida. The square…

A: Samples of size n=4000

Q: on jan 15 the temperature is 4 degre standar deviation above the mean what is temperature on jan 15

A: Given that Mean temperature = 16 And SD = 0.5 Let x denote the temperature on Jan 15.

Q: The Atlanta Braves baseball team as a mean batting average of 250 with a standard Deviation of 20.…

A: Given that, mean mu=250  and standard deviation, sigma=20 we know that z score is given by, z score=…

Q: A normal distribution of scores has the following: mean = 120 standard deviation = 20 What range of…

A: given data normal distribution μ = 120σ = 20 for middle 60%  range = ?

Q: Average words in a romance novel is 64,253 and the standard deviation is 17,467 assuming the…

A: μ = 64253σ = 17467

Q: How many adults must be randomly selected to estimate the mean FICO (credit rating) score of working…

A: By using the provided information, We have 95% confidence level Margin of error = 4 Population…

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: Compute the mean and standard deviation for the sample below, rounding each to the nearest…

A: Measure of central tendency measures the central or average value of a dataset. Measured of…

Q: Energy consumption for single family comes is a mean of 1050kw and standard deviation of 218kw. Find…

A: Given information- Population mean, μ = 1050 kw Population standard deviation, σ = 218 kw We have to…

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: on first math exam , the class average was 90 with a standard deviation of 10. you scored an 100.…

A: The class average was 90 with a standard deviation of 10. That is, μ=90,σ=10. He scored an 100. That…

Q: Traffic department wants to know if automobile accident is a very serious problem in Central…

A: Null hypothesis:µ=3.Alternative hypothesis:µ≠3This is a two tailed test.Since the population…

Q: The mean score in a test is normally distributed with mean 30 and standard deviation 10. What is…

A: Given :  Mean, μ = 30 standard deviation, σ = 10 x = 55

Q: n Professor Krugman's economics course, the correlation between the students' total scores prior to…

A: Solution: Given information:  Let x= The pre‑exam totals  and  y= The final‑exam scores  r= 0.5…

Q: Birth weight, in grams, of newborn babies are normally distributed with a mean of 3290 grams and a…

A: Mean=3290gmStandard deviation =520gm

Q: After a snow storm, the depth of snow in my yard is normally distributed with mean 4.5 inches and…

A: The mean is 4.5 and the standard deviation is 0.25 inches.

Q: A commonly used standardized test in psychology research is designed so that the mean score of all…

A: From the provided information, Mean (µ) = 140 Standard deviation (σ) = 20 X~N (140, 20) Here X be a…

Q: The time needed to take an exam is normally distributed with an average of 120 minutes and a…

A: Given,mean(μ)=120standard devition(σ)=20

Q: Mean is 235, standard deviation is 52, what is the percentile of a raw score of 28

A: Mean Standard deviation

Q: Scores in a particular Mathematics test are normally distributed with mean of 175 and standard…

A: given datanormal distributionμ=175σ=20p(105<x<180) = ?

Q: A mandatory competency test for high school sophomores has a normal distribution with a mean of 495…

A:

Q: The Psych 230 students finished the course with a total population mean of 130 points and the…

A:

Q: A student will spend 15 hours average each week in class. If the standard deviation is 2 hours, what…

A: Given that mean=15 and standard deviation = 2 Let, X= number of hours spent by a student in the…

Q: In how many ways can a photographer at a wedding arrange 6 people in a row from a group of 10…

A: Given that the picture has to be taken for 6 people out of 10 where exactly one of the bride or the…

Q: A mandatory competency test for high school sophomores has a normal distribution with a mean of 410…

A:

Q: Two thousand students took an exam. The scores on this exam are Normally distributed with mean =81…

A:

Q: Mean=3290 miles Standard deviation of 384 miles. What is the probability that the mean of a sample…

A:

Q: In a large section of a statistics class, the points for the final exam are normally distributed,…

A: