A quick survey of peanut butter prices had standard deviation and mean of $0.26 and $3.68, respectively. Compute the area for a peanut butter jar costing between $3.50 and $4.25.

Q: Why is the standard deviation preferable to the range as a measure of variation?

A: A range is the most common and easily understandable measure of dispersion. It is the difference…

Q: Assume the average (mean) number of minutes a group of people meditate is 20 minute per day and has…

A: Solution: Let X :  A group of people mediate.  Assumed X be the normal distribution with mean 20…

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: Find the number of boys and the combined standard deviation

A: Given :  Our aim is to find the number of boys and combined standard deviation.

Q: On the Gulf Freeway at 7:00 AM, the average travel time from Beltway 8 to Downtown is 29.5 minutes…

A: From the given information,   Mean = 29.5 Standard deviation = 11.2   The objective is to calculate…

Q: The mean annual automobile insurance premium is $950, with a standard deviation of $175. The data…

A:

Q: The annual commissions per salesperson employed by a retailer of mobile communication devices…

A: From the provided information, Mean (µ) = $43600 Standard deviation (σ) = $4600

Q: A trucking company determined that the distance traveled per truck per year is normally distributed,…

A: Here, mean is 60 thousand and standard deviation is 10 thousand. a. The proportion of trucks can be…

Q: Assume that the distribution of systolic blood pressure of adult men has a mean of 110 mmHg and…

A:

Q: Find the mean, mode and standard deviation of the distribution.

A: Given: f(x)=1x2πe-12logx2      for x>0       =0  for  x<0

Q: According to a government study, among adults in the 25- to 34-year age group, the mean amount spent…

A: Given : The mean amount spent per year on reading and entertainment is $1,994. Assume that the…

Q: During I week, an overnight delivery company found that the weights of its parcels were normally…

A: 1. a. The percent of the parcels weighed between 12 oz and 30 oz is obtained below: It is given that…

Q: Compute for the median, and standard deviation of the given data

A:

Q: On a standardized exam, the scores are normally distributed with a mean of 35 and a standard…

A:

Q: Write the steps of calculating the population standard deviation.

A: Standard deviation: The standard deviation is based on how much each observation deviates from a…

Q: The number of chocolate chips in an 18-ounce bag of chocolate chip cookies is approximately normally…

A:

Q: Given a distribution with a mean of 70 and a standard deviation of 62, find a value with a z-score…

A:

Q: What is the difference between what the z score measures and what the standard deviation measure?

A: z score is standard score and the formula for finding z score is,

Q: For a population with a standard deviation of σ = 5, what is the z-score corresponding to a score…

A: We have to find z score..

Q: The weight of a division I college football player has a mean of 255lb and a standard deviation of…

A:

Q: Find the range and standard deviation for the data items in the histogram below. 5 4 Frequency

A: From the histogram, The frequency table is, Data Frequency 10-20 2 20-30 5 30-40 5 40-50…

Q: Find the standard deviation for the grouped data.

A: Solution; Interval Frequency (f) midpoint(x) fx (x-x)2 f*(x-x)2 50-59 7 54.5 381.5 351.5625…

Q: The final exam scores in a statistics class were normally distributed with a mean of 63 and a…

A: The final exam scores in a statistics class were normally distributed with a mean of 63 and a…

Q: Refer to the accompanying table, which describes the number of adults in groups of five who reported…

A: From the provided information, X 0 1 2 3 4 5 P(x) 0.169 0.363 0.306…

Q: Define the term standard deviation?

A: Standard deviation: The standard deviation indicates by how much each observation differs from a…

Q: In a statistics class of 150 students, the mean and standard deviation of scores was 70 and 5,…

A: Given: The total number of students are N=150. The mean scores of students in a statistics class is…

Q: A quantitative data set has a size of 50. At least how many observations lie within seven standard…

A: Suppose X is a random variable with expectation, μ and standard deviation, σ. Then, for any positive…

Q: What is the difference between the standard deviation and CV? When it is appropriate to use each…

A: Standard deviation: It is square root of variance. It is obtained by taking square root of sum of…

Q: In a normal distribution, find the proportion of the population within three fifths of a standard…

A: We have to find out given proportion..

Q: The scores of students on an exam are normally distributed with a mean of 468 and a standard…

A:

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

A:

Q: For a recent 10k​ run, the finishers are normally distributed with mean of 56 minutes and a standard…

A: Given data,μ=56σ=13P(45<X<70)=?

Q: Determine the mean and the standard deviation.

A: We have Given a binomial Distribution that is our random variable X~b(n,p) with parameter n=50,…

Q: An agronomist measured the height of 134 canola plants. The mean height was 214 cm and the standard…

A:

Q: Given an approximately normal distribution with a mean of 175 and a standard deviation of 37,…

A: Given info: Here, mean is 175 and standard deviation is 37.

Q: Refer to the accompanying​ table, which describes the number of adults in groups of five who…

A: Mean :-  ∈x = ∑  ×. Px                           ∈x =…

Q: In a normal distribution, if the mean is ten and the standard deviation is one, what would the…

A:

Q: The number of chocolate chips in an​ 18-ounce bag of chocolate chip cookies is approximately…

A: According to the Question, The number of chocolate chips in an​18-ounce bag of chocolate chip…

Q: Find the median and the standard deviation of the scaled marks of all the students.

A: According to the answering guidelines,  we can answer only one question and the rest can be…

Q: An instructor in a large lecture class found, at the end of the semester, that the total point…

A: It is given that mean and standard deviation are 530 inches and 80, respectively.

Q: According to Chebyshev's Rule, at least what percent of observations must be within 2.5 standard…

A:

Q: Suppose that the average height of men in the United States is approximately normally distributed…

A: From the provided information, Mean (µ) = 70 Standard deviation (σ) = 4 X~N (70, 4) Here X be a…

Q: A quick survey of peanut butter prices had standard deviation and mean of $0.26 and $3.68,…

A: Explanation:Here given the standard deviation and mean value and find the area for a peanut  butter…

Q: The data set has size 80. Approximately how many observations lie within two standard deviations to…

A: Empirical rule: On a normal distribution about 68% of data will be within one standard deviation of…

Q: Based on the relationship between the mean, standard deviation, and minimum time, is it reasonable…

A: HERE WE CAN USE THAT minimum value is approx 3 times standard deviation away from mean.

Q: The daily water usage per person in Davao City is normally distributed with a mean of 20 gallons and…

A: Given that, Mean = 20 Standard deviation = 5

Q: If a raw score is 28 in a distribution in which the mean is 20 and the standard deviation is 2, what…

A: Given information- Population mean, µ = 20 Population standard deviation, σ = 2 We have to find the…

Q: Rosencrantz and Guildenstern are on a weight-reducing diet. Rosencrantz, who weighs 178 lbs.,…

A: Given data,For RosencrantzMean =145sd=15Weight is x=178For GuildensternMean =165sd=20Weight is x=204

Q: The Fresha Tea Company pack tea in bags marked as 250 g. A large number of packs of tea were weighed…

A: Mean = 255g Standard deviation = 2.5g P(X < A) = P(Z < (A - mean)/standard deviation) P(X <…