The mean length of stay for patients undergoing a certain surgical procedure is 4 days with a standard deviation of 3.5 days. We select a sample of 100 patients. What is the probability their mean length of stay is less than 3 days? Round to four decimal places.

Q: The average score of all golfers for a particular course has a mean of 76 and a standard deviation…

A:

Q: On a statistics exam, the mean score was 80 and there was a standard deviation of 7. If a student's…

A: Given data, μ=80σ=7If x=92z=?

Q: ample of 3000 persons were surveyed for their walght in pounds, the mean weight is 135 lbs with a…

A:

Q: A statistics professor gave a final exam to a class of 30 students. The exam scores are normally…

A: Given,mean(μ)=75standard deviation(σ)=10

Q: CNNBC recently reported that the mean annual cost of auto insurance is $962. Assume the standard…

A: Given information: The mean annual cost of auto insurance is $962. The standard deviation is $190.…

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: A history class has 95 members. If there is a 22% absentee rate per class meeting , find the mean…

A:

Q: 500 freshmen at Crescent High School took an algebra test. The scores were distributed normally with…

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

Q: A flu test shows that about 31% of 90 patients visited hospital in the first week of January had…

A: Given that  n = 90 , p = 31% = 0.31 , q = 1 - p = 1 - 0.31 = 0.69 X ~ Binomial (n = 90 , p = 0.31) X…

Q: The intelligence quotient (IQ) score is normally distributed in a certain population of children.…

A:

Q: The average score of this quiz is 24 points with a standard deviation of 1.5 points. What is the…

A: Let us assume that X=score of a quizX follows a normal distribution with mean=24 and standard…

Q: If the probability of defective bolt is 0.1, find the mean and the standard deviation for the number…

A: Given the probability of a defective bolt is, 0.1 That is, p=0.1 The total number of bolts is, n=400…

Q: The mean of a test is 400 and the standard deviation is 75. It is normally distributed. A sample of…

A: 1] Mean μ=400 2] standard deviation σ=75 3] n=25 4] μx¯=400σx¯=σn=7525=15

Q: The amount of pyridoxine in grams per multiple vitamin pill has a mean of 180 and a standard…

A: Given,mean(μ)=180standard deviation(σ)=24sample size(n)=64

Q: A normal distribution is observed from the body weights of the forty students in a class. If the…

A: Given information Mean (µ) = 125 Standard deviation(σ) = 9 As per empirical Rule 68% falls within…

Q: The average score of all golfers for a particular course has a mean of 64 and a standard deviation…

A:

Q: The grades for the latest statistics exam are normally distributed. The mean was 93 with a standard…

A: According to question given that Mean (μ)=93Standard deviation (σ)=4As we know that relation between…

Q: You plan to build a Confidence Interval to estimate the mean of a population for which the standard…

A: Given that  Standard deviation(σ) = 11.8 Confidence level (C) = 92%  Margin of error (E) = 0.7   We…

Q: When Christian runs the 400 meter dash, his finishing times are normally distributed with a mean of…

A:

Q: Proctor & Gamble reported that an American family of four washes an average of 1 ton (2000…

A: Introduction:Here, the suggested population mean, μ = 2,000 pounds.The population standard…

Q: The amount of money an American spends on Holiday presents is normally distributed with a mean of…

A: Given Mean=650 Standard deviations=80

Q: The standard deviation of the scores on a skill evaluation test is 290 points with a mean of 1286…

A: We have to find given Probability.

Q: If the standard error,  of a sample data set is 5 and the standard deviation,  of the distribution…

A: For a population with mean µ  and standard deviation σ, the standard error is σx̅ = σ/√n, where x̅…

Q: The average score of all golfers for a particular course has a mean of 61 and a standard deviation…

A: From the provided information, Mean (µ) = 61 Standard deviation (σ) = 3.5 Sample size (n) = 49 Let X…

Q: Scores on the SAT test have a mean of 1518 and a standard deviation of 325. If 100 students are…

A: Scores on the SAT test have a mean of 1518 and a standard deviation of 325.

Q: The average score of all golfers for a particular course has a mean of 71 and a standard deviation…

A: Solution: Let X be the score of golfer for a particular course. From the given information, X has a…

Q: The average score of this quiz is 24 points with a standard deviation of 1.5 points. What is the…

A: Given data,μ=24σ=1.5P(X<21.9)=?

Q: The local police force gives all applicants an entrance exam and accepts only those applicants who…

A: The score that corresponds to the top 15% is, The Z-score that corresponds to the area 0.85 is…

Q: A person in the U.S. eats about 25 pounds of M&M's per year with a standard deviation of 3 pounds.…

A: Assume that a person in the U.S. eats of M&M's per year follow normal distribution. μ=25σ=3 Let…

Q: The lengths of Atlantic Croaker Fish are normally distributed with mean of 10 inches and a standard…

A: Given that  X~N( μ = 10 , ? = 2 ) μ = 10 , ? = 2 , n=200 Z-score =( x - μ )/?

Q: The following table contains the probability distribution for the number of traffic accidents daily…

A:

Q: 500 freshmen at Crescent High School took an algebra test. The scores were distributed normally with…

A: Given information: MEan=75 Standard deviation=7

Q: there are 75 students in the class and 20 students are getting a+ grade in the class find the mean…

A: