Consumer Reports rated airlines and found that 80% of the flights involved in the study arrived on time (i.e., within 15 minutes of scheduled arrival time). Assuming that the on-time arrival rate is representative of the entire commercial airline industry, consider a random sample of 188 flights. (Round your answers to two decimal places.) What is the standard deviation of this distribution?

Q: Experience has shown that the value of orders placed by customers of Handy Glass Pty is normally…

A: From the provided information, Mean (µ) = 200 Standard deviation (σ) = 755 Sample size (n) = 85

Q: How many standard deviations to either side of the mean must we go to ensure that, for any data set,…

A:

Q: Given a uniform distribution with endpoints 4 and 22: What is the mean?        What is the…

A:

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

A: Given data, Mean = 69 SD = 7

Q: Twenty-nine percent of adult Internet users have purchased products or services online. For a random…

A: It is given that 29% of the users purchase online. Therefore, probability of a randomly selected…

Q: In a recent year, the ACT scores for high school students with a 3.50 to 4.00 grade point average…

A: The mean is 25.7 and the standard deviation is 3.3.

Q: How many standard deviations to either side of the mean must we go to ensure that, for any data set,…

A:

Q: For the Reese's pieces scenario, compute the standard deviation of sample taking if the size of the…

A:

Q: Statewide, the average score on the verbal test portion of the college exam is 453, with a standard…

A: From the given information, the sample size is 137, sample mean is 502, population mean is 453 and…

Q: A random sample of 8 adults aged 30 years were asked how much they spent on medical costs in the…

A: After enable the MegaStat Add-In into EXCEL, enter the given data in EXCEL sheet.

Q: A used car dealer says that the mean price of a three-year-old sports utility vehicle is $19,000.…

A:

Q: A carpet manufacturer is inspecting for flaws in the finished product. If there are too many…

A: It is known that the sampling distribution of the sample mean x-bar will have a standard deviation,…

Q: Given a normal distribution with a standard deviation of 14, what is the mean if 40% of the values…

A: We know that; X~Normal(μ,σ2) ⇒Z=X-μσ~Normal(0,1) Let X be the random variable with a normal…

Q: Given a distribution with a mean of 90 and a standard deviation of 10, what is the probability of…

A: Given Information: μ=90 σ=10 x1=85 x2=110

Q: The director of admissions at Kinzua University in Nova Scotia estimated the distribution of student…

A: 1000 0.6 600 1000000 600000 1200 0.3 360 1440000 432000 1500 0.1 150 2250000 225000

Q: The average cost of tuition, room and board at small private liberal arts colleges is reported to be…

A: The test statistic is, The degrees of freedom is,

Q: For the Reese's pieces scenario, compute the standard deviation of sample taking if the size of the…

A: Answer - For the Reese's pieces scenario, the size of the samples is n =  200 and the proportion of…

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: Given a population where p = 0.10, find the standard deviation of the samping distribution when the…

A: It is given that p is 0.10.

Q: The prices of all college textbooks follow a bell- shaped distribution with a mean of $100 and a…

A:

Q: For the binomial​ distribution, which formula finds the standard​ deviation?

A: Consider the terms for any binomial distribution.

Q: s the standard deviation of the following data set?  State your result as a decimal value with two…

A: The table that shows the necessary calculation is depicted as: x x−¯x (x−¯x)2 1 -2.5 6.25…

Q: A normally distributed population has a mean of 88 and a standard deviation of 10. When a sample of…

A: Here the given population mean is 88 and population standard deviation is 10.

Q: The results of a calculus exam are normally distributed with a mean of 76 and a standard deviation…

A:

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

A:

Q: Given a mean price of a residential real estate sales of KD 527,000 and a standard deviation of KD…

A: To find the probability of: a) having a sale above KD 550,000 b) having a sale below KD 527,500

Q: The number of cartoons watched by Mrs. Kelly's first grade class on Saturday morning is shown below.…

A: 0 0.15 0 0 0 1 0.20 0.2 1 0.2 2 0.30 0.6 4 1.2 3 0.10 0.3 9 0.9 4 0.20 0.8 16 3.2 5 0.05…

Q: Given a standardized normal distrubtion (with a mean of 0 and a standard deviation of 1, as in Table…

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

Q: On a normal distribution, four participants obtained the following deviation scores: –5, 0, +3, and…

A: Consider that the mean and standard deviation of a random variable X are µ and σ, respectively.…

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

A: The mean incubation time 69 and standard deviation 8 The lowest score for A is calculated as…

Q: Consider a sample with a mean of 500 and a standard deviation of 100. What are the z-scores for the…

A: Consider that the sample mean and standard deviation of a random variable x are x̄ and s,…

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

A: Finding the lowest score that would qualify a student for an A grade:The points for the final exam…

Q: What is the value of k?   What is the standard deviation?

A: Here use basic of discrete probability distribution

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

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

Q: A physical fitness association is including the mile run in its secondary-school fitness test. The…

A: P(X<348)=?

Q: For a random sample of 500 students aged 15-17 in the United States, the numbers of hours a week…

A:

Q: A survey of 10 fast-food restaurants noted the number of calories in a mid-sized hamburger. The…

A: There are total n = 10 observations.

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

A: The mean incubation time 69 and standard deviation 18 The cutoff for A is calculated as follows:…

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…

Q: en the name-brand drug (control group). In the control group, the deviation of 11.5 mmHG. In the t a…

A:

Q: Given a distribution with a mean of 80 and a standard deviation of 10, what is the probability of a…

A: Given that  Mean=80 , Standard deviation=10 Find  P(X<=65)

Q: Find the standard deviation for the given data. Round to one more decimal place than the original…

A: We have given that,  Rhe data set are: X:- 3, 5, 6, 6, 9, 1 Then,  We will find the standard…

Q: At the local liquour store, a single purchase approximately follows a normal distribution with a…

A:

Q: The results of a calculus exam are normally distributed with a mean of 76 and a standard deviation…

A:

Q: A local university administers a comprehensive examination to the recipients of a B.S. degree in…

A: The sample standard deviation can be calculated as:

Q: For a population with a mean of mean=45 and a standard deviation of 10, what is the standard error…

A:

Q: A statistical analysis of a very large sample of fully-assembled medical devices indicates that the…

A:

Q: The annual incomes of all MBA degree holders working in Los Angeles have a bell-shaped distribution…

A: From the provided information, Mean (µ) = $78,000 Standard deviation (σ) = $11,000 Let X be a random…

Q: A random sample of 12 students showed the following time (in hours) of sleep 4.5 5 5.5 6 6 7 7.5 7.5…

A:

Q: For a sample, a score that is 12 points above the mean has a z-score of z = 1.20. What is the sample…

A: We have to find sample standard deviation

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.