The time to complete a standardized exam is approximately normal with a mean of 70 minutes and a standard deviation of 10 minutes. Suppose the students are given one hour to complete the exam. The proportion of students who don't complete the exam is O 0.500. O 0.159. O 0341

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

A: Given, The points of final exam follows normal distribution with mean 73 and standard deviation 8.…

Q: If the age distribution of customers at a major retail chain is thought to be bell-shaped with a…

A:

Q: In your school with 400 Grade 11 students, the final examination in General Mathematics has a mean…

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Q: Suppose that the cost of annual tuition at colleges is normally distributed, with an average annual…

A: Denote X as the cost of annual tuition at colleges. It is given that X is normally distributed, with…

Q: The average number of acres burned by forest and range fires in large New Mexico county is 4,300…

A: GivenMean(μ)=4300standard deviation(σ)=750

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A: Normal Distribution: A continuous random variable X is said to follow Normal distribution with…

Q: A survey of 1000 men ages 20 to 30 found that their heights were normally distributed, with a mean…

A: Solution: Let X be the height of men ages 20 to 30. From the given information, X follows normal…

Q: The We Go Farther Tire Company advertises a tire that lasts for 80,000 miles. The mileage for the…

A:

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

A: Given μ= Mean =71 σ= standard deviation =8  Top​ 10% receive​ A's  Next​ 20% received​ B's Middle​…

Q: For a population with a standard deviation of σ = 20, how large is a sample  necessary to have a…

A: The standard deviation is 20.

Q: The mean score for a test is 87 with a standard deviation of 12.  Assuming a normal distribution for…

A: Given,mean(μ)=87standard deviation(σ)=12

Q: The grades on a midterm were Normally distributed with a mean of 120 and a standard deviation of 17.…

A: GivenMean(μ)=120standard deviation(σ)=17

Q: On a standardized exam, the scores are normally distributed with a mean of 300 and a standard…

A:

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

A: Given, final exam score follows normal distribution mean 73 and standard deviation 8. Grades are…

Q: A distribution is given as X ~ U(0, 12). What is the theoretical standard deviation?

A: concepts and reasonuniform distribution is a continuous probability distribution.it is defined…

Q: Steel rods are manufactured with a mean length of 27 centimeter​ (cm). Because of variability in the…

A: Given Data Population Mean,μ = 27.0 Population Standard Deviation,σ = 0.06

Q: The students in an AFDA class have a mean height of 66 inches and a standard deviation of 7 inches.…

A: Mean(µ) = 66Standard deviations (σ) = 7

Q: A study determined the average amount a person spends on candy during Halloween is $80 with a…

A: Here, μ=80 and σ=15

Q: The amount of rain falling in Waimea Canyon State Park, Kauai is normally distributed with a mean of…

A: Let x¯ is defined as the mean rain of 16 randomly picked days which follows normal distribution. The…

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

A:

Q: The spending at Target is distributed normally with a mean spending of $45.67 and a standard…

A: According to the provided information, mean = $45.67  standard deviation = $5.50

Q: Find the lowest score on the final exam that would qualify a student for an​ A, a​ B, a​ C, and a D

A: Given that the mean value is 76 and the standard deviation is 7. Grades are assigned such that the…

Q: A score that is 6 points below the mean corresponds to a z-score of z = -2.00. What is the…

A: Given: z-score = -2.00 Formula: Where,

Q: A particular battery claims to have a mean life of 400 hours with a standard deviation of 30 hours.…

A: Mu=400, sigma=30 P(X>420)= ?

Q: A midterm exam has a mean of 76.0 and a standard deviation of 8.0. If any student with a z-score of…

A:

Q: The iPhone battery capacity is normally distributed with a mean of 4 years and a standard deviation…

A: Note: “Since you have posted a question with multiple sub-parts, we will solve first three subparts…

Q: Steel rods are manufactured with a mean length of 27 centimeter​ (cm). Because of variability in the…

A: Given,mean(μ)=27standard deviation(σ)=0.06

Q: On a standardized exam, the scores are normally distributed with a mean of 650 and a standard…

A:

Q: Approximately how many policemen have waist girth less than 37.25 inches

A: The waist of 2,500 policemen is normally distributed with a mean of 35 inches and a standard…

Q: . Sheldon owns a mango farm and the weight of his mangoes are normally distributed with an average…

A: here  N = 800 n = 50 μ = 200 gramσ = 15 grams

Q: For a sample of 18 cars, you find the standard deviation of the price is 6150. What is the standard…

A: Given: Sample size=n=18,Standard deviation=σ=6150.

Q: The spending at Target is distributed normally with a mean spending of $47.67 and a standard…

A:

Q: A department store has daily mean sales of $ 28,372.72. The standard deviation of sales is $2000. On…

A: Given information- Mean sales, μ = $ 28,372.72 Population standard deviation, σ = $2000 Tuesday’s…

Q: Assume that the heights of a population of adults form a normal distribution with a mean µ =69…

A: It is known that, there are 12 inches in 1 foot.The provided information are:

Q: The average grade for an exam is 74, and the standard deviation is 7. If 12% of the class is given…

A: Let the random variable X denote grade score. Then, X~Nμ, σ2 with μ=74 and σ=7. Let α be the lowest…

Q: In order to set rates, an insurance company is trying to estimate the number of sick days that full…

A: Given Margin of error=1 Standard deviation=3.6 Significance level=0.05

Q: The heights of women have a symmetric distribution with a mean of 66 inches and a standard deviation…

A: Given dataMean = 66 inchesStandard deviation =2.5 inchesApplying empirical formula68% of data falls…

Q: The final score for a mathematics exam is normally distributed, with an average score (µ) of 57 and…

A: GivenMean(μ)=57standard deviation(σ)=9.25

Q: In a survey, 35 people were asked how much they spent on their child's last birthday gift. The…

A: Confidence interval is a concept closely related to interval estimation. Confidence interval is…

Q: The distribution of the annual incomes of a group of middle management employees approximated a…

A: In question, The distribution of annual income of middle management employees approximated normal…

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Q: Statewide, the population as a whole watches 6.2 hours of TV per day. A random sample of 1017 senior…

A: Given data is appropriate for testing of hypothesis to test z-test for single mean because it is a…

Q: On a standardized exam, the scores are normally distributed with a mean of 170 and a standard…

A: We have to find z score..

Q: A particular fruits weights are normally distributed, with a mean of 797 grams and a standard…

A: Let us assume X= weight of a particular fruit Given that X follows a normal distribution with mean=…

Q: The exam scores of 200 students are distributed normally with a mean of 72 and a standard deviation…

A: Total students = 200 Standard deviation = 10 And distribute mean = 72 We have to find the number of…

Q: What happens to the standard deviation if the differences between the mean and data values are…

A: The standard deviation, which is described through a mathematical quantity to measure the amount of…

Q: Multiple questions

A: Given dataMean = 71Standard Deviation = 8a)The Lowest Score for A grade is given by p-value will be…

Q: The variance in a data set is 427. Find the standard deviation. Round to two decimals.

A: The random variable is X. It is given that the variance is 427. We have to find the standard…

Q: Suppose that the amount of time that takes place for the Bureau of Internal Revenue to send refunds…

A: Solution: 4. Let X be the amount of time. From the given information, X follows normal distribution…

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

A: Given, Mean = 71 SD = 8