The mean time spent studying for this quiz is 25.3 minutes, with a standard deviation of 3.7 minutes.  The data is known to be bell-shaped.  What percentage of students study between 14.2 minutes and 36.4 minutes.

Q: Find the proportion of customers who use ATMs less than times 55. Use four decimal places for your…

A: It is given that  From first data: Mean, μ = 40 Standard deviation, σ = 11.3   From second data:…

Q: The lifetime of lightbulbs has a mean of 1500 hours and a standard deviation of 100 hours. A sample…

A: Let the random variable X denote the lifetime of light bulbs. It is given that X has a mean of 1500…

Q: College Professors have incomes with a standard deviation that is more than $21,000. A recent study…

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Q: The mean finish time for a yearly amateur auto race was 187.43 minutes with a standard deviation of…

A: Given information- Population mean, µ = 187.43 minutes Population standard deviation, σ = 0.363…

Q: The National Center for Health Statistics reports that the systolic blood pressure for males 35 to…

A:

Q: The sample standard deviation is one measure that describes the value in the sample that the data…

A: A single number that seeks to represent a set of data by identifying the center position within that…

Q: video game c

A: given, sample size(n) = 1500 sample mean (x̄) = 115 sample stadard deviation (s) = 11

Q: The average hours of sleep on a weeknight was 6.9 hours with a standard deviation of 1.5 hours. What…

A: Introduction: Denote the random variable, Denote X as the number of hours of sleep on a weeknight.…

Q: The lifetime of light produced by a company is normally distributed with standard deviation of 80…

A: Given : Let X : Lifetime of light produced by a company is normally distributed with  Standard…

Q: A particular leg bone for dinosaur fossils has a mean length of 5 feet with a standard deviation of…

A: Given, A particular leg bone for dinosaur fossils has a mean length of 5 feet with a standard…

Q: The average time it takes a certain brand of ibuprofen to start working is 25 minutes, with a…

A: Given Information :  The average time it takes a certain brand of ibuprofen to start working is 25…

Q: The heights of adult men in America are normally distributed, with a mean of 69.2 inches and a…

A: Given, The heights of adult men in America are normally distributed, with a mean of 69.2 inches and…

Q: The mean finish time for a yearly amateur auto race was 186.77 minutes with a standard deviation of…

A: Formula for z score : z = x-μσ

Q: in city, the average 20- to 29-year old man is 69.4 inches tall, with a standard deviation of 3.0…

A: Let X be hight of Man from normal distribution with mean (μ) = 69.4, standard deviation (σ) = 3.0…

Q: Rashid is 84 inches tall. If the height of males in the United States is nor- mally distributed with…

A: Height of Rashid = x = 84 inches. Mean =  70 Standard deviation = 4 The z-score is given by z-score…

Q: An incoming freshman took her college’s placement exams in French and mathematics. In French, she…

A:

Q: Jeffrey, as an eight-year-old, established a mean time of 16.43 seconds for swimming the 25-yard…

A: Given n=15 x=16σ=0.8μ=16.43α=0.05

Q: Americans (on average) individually eat 16 pounds of seafood each year with a standard deviation of…

A: Given that   x̄ = 14 , μ = 16 , ? = 7 , n = 4

Q: The typical college freshman spends an average of ?=150minutes per day, with a standard deviation of…

A: Solution: Let X be the time on social media. From the given information, X follows normal…

Q: Adult women in the U.S. have a mean height of 64.3", with a standard deviation of 2.58 inches.…

A:

Q: A banker finds that the number of times people use automated-teller machines (ATMs) in a year are…

A: The mean is 40 and the standard deviation is 11.

Q: The luggage weight for individual air travelers on some specific route have a mean of 80 pounds and…

A: Given information: The luggage weight for individual air travelers on a specific route, measured in…

Q: The mean height of a population of men is 70.8 inches and the standard deviation is 3.2 inches. What…

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Q: According to a report by the U.S. Fish and Wildlife Service, the mean length of six-year-old rainbow…

A: As per Bartleby guideline expert have to answer first question only dear student please upload other…

Q: Most graduate schools of business require applicants for admission to take the Graduate Management…

A: Given that  μ=527σ=112

Q: Professor Ivy’s students have a Mean grade of 69.5 and a Standard Deviation of 6.5.  If Johnny has…

A: From the provided information, Mean (µ) = 69.5 Standard deviation (σ) = 6.5 Let X be a random…

Q: The reading speed of sixth-grade students is approximately normal, with a mean speed of 125 words…

A: Given: μ= 125 σ = 24 The formula pf z score is, Z=X-μσ The value of z at the 80th percentile, i.e.,…

Q: Mrs. Saint's Biology Test had a mean score of 75 with a standard deviation of 8.  Find the Z-score…

A: The Z score is a statistical tool that tells you how many standard deviations away is your data from…

Q: In a recent study, the serum cholesterol levels in men were found to be normally distributed with a…

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

Q: A newspaper article reported that people spend a mean of 6.5 hours per day watching TV, with a…

A: Given data ,μ=6.5σ=2.0Pz>z=10 %

Q: The heights of adult men in America are normally distributed, with a mean of 69.1 inches and a…

A: Heights of adult men is Normally Distributed with mean 69.1 inches and standard deviation 2.68…

Q: The mean finish time for a yearly amateur auto race was 186.73 minutes with a standard deviation of…

A: Z-SCORE =(X-mean) /standard deviation

Q: A manufacturer claims that the mean lifetime of its lithium batteries is 1400 hours. A homeowner…

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Q: Coronary bypass surgery: The Agency for Healthcare Research and Quality reported that 53% of people…

A:

Q: A second species of extra-terrestrial has a mean height of 71cm and a standard deviation of 5.3cm.…

A:

Q: The advertised weight is 2.13 ounces , the mean is 2.2 ounces and the standard deviation is 0.04…

A: P(X < 2.13) = = P(Z < -1.75)= 0.0401 or 4.01%

Q: The mean finish time for a yearly amateur auto race was 187.07 minutes with a standard deviation of…

A:

Q: What is the standard deviation?

A: We have to calculate the SD for the given frequency distribution.

Q: The number of chocolate chips in a bag of chocolate chip cookies is approximately normally…

A: It is given that the mean and standard deviation are 1,262 and 117, respectively.

Q: According to a marketing website, adults in a certain country average 51 minutes per day on mobile…

A: We are given,Mean = μ = 51Standard deviation = σ = 7Percentile = 80th

Q: The Drive-thru lane at Chick-fil-a's mean wait time is 7 minutes with a standard deviation of 2…

A: 8. The standard deviation for sampling distribution of means is, σx¯=σn=210=23.16227766=0.6325

Q: The number of text messages that teenagers send per month is normally distributed with a mean of…

A: We have given that  X~N(mu,sigma ^2) mu=3400,sigma =450 and X=4415 Z-socre =(X-mu)/sigma

Q: The mean finish time for a yearly amateur auto race was 185.81 minutes with a standard deviation of…

A:

Q: The heights of adult men in America are normally distributed, with a mean of 69.8 inches and a…

A: The heights of adult men in America are normally distributed, with a mean of 69.8 inches and a…

Q: The starting salary for a computer programmer major has a mean of $39,269 and a standard deviation…

A:

Q: Jeffrey, as an eight-year old, established a mean time of 16.43 seconds for swimming the 25-yard…

A: Population mean = ? = 16.43 Population S.D = ? =0.8 Sample size = n =15 Sample mean = x̅ = 16

Q: The fuel efficiency, in miles per gallon, of 10 small utility trucks was measured. The results are…

A: Given fuel efficiency 22 25 23 27 15 24 24 32 23 22 25 22

Q: What is the Standard Deviation?

A: You want to know about standard deviation.We will deeply understand the meaning of standard…

Q: A certain brand of automobile tire has a mean life span of 37,000 miles and a standard deviation of…

A: Let X be the lifespan that follows normal distribution with mean μ = 37,000 miles and standard…

Q: The lifetime of lightbulbs has a mean of 1500 hours and a standard deviation of 100 hours. A sample…

A: