A company has a policy of retiring company cars; this policy looks at the number of miles driven, the purpose of trips, style of car, and other features. The distribution of the number of months in service for the fleet of cars if bell-shaped and has a mean of 63 months and a standard deviation of 9 months. Using the 68-95-99.7 rule, what is the approximate percentage of cars that remain in service between 81 and 90 months?

Q: The physical plant at the main campus of a large state university recieves daily requests to replace…

A: The normal distribution is the bell shaped distribution which is centred at the mean. This is also…

Q: . What proportion of trucks can be expected to travel between 67 and 80 thousand miles in a​ year?…

A: Let , X→N(μ=80 , σ=11) Our aim is to find the following :  a) What proportion of trucks can be…

Q: In a mid-size company, the distribution of the number of phone calls answered each day by each of…

A:

Q: A sample of 55 mutual funds was taken and the mean return in the sample was 14.1% with a standard…

A: Introduction: Denote μ as the true mean return on an actively-managed mutual fund.

Q: l plant at the main campus of a large state university recieves daily requests to replace florecent…

A: The distribution of the number of daily requests with a mean of 46 and a standard deviation of 9 is…

Q: Assume that military aircraft use ejection seats designed for men weighing between 149.9 lb and 206…

A:

Q: The distribution of the number of months in service for the fleet of cars is bell-shaped and has a…

A: From the provided information, Mean (µ) = 51 Standard deviation (σ) = 7 Let X be a random variable…

Q: The physical plant at the main campus of a large state university recieves daily requests to replace…

A:

Q: The drive distance (in yards) for professional golfers is normally distributed with a mean of 282.63…

A: The normal distribution: A continuous random variable X is said to follow normal distribution with…

Q: The physical plant at the main campus of a large state university recieves daily requests to replace…

A: We have given that the random variable X i.e. lightbulb is normally distributed with mean 59 and…

Q: The physical plant at the main campus of a large state university recieves daily requests to replace…

A:

Q: In a mid-size company, the distribution of the number of phone calls answered each day by each of…

A: the empirical rule predicts that1)68% of observations falls within the first standard deviation (µ ±…

Q: In a mid-size company, the distribution of the number of phone calls answered each day by each of…

A: Given,mean(μ)=53standard deviation(σ)=5Empirical rules:1) P(μ-σ<X<μ+σ)=68%2)…

Q: The physical plant at the main campus of a large state university recieves daily requests to replace…

A:

Q: The physical plant at the main campus of a large state university recieves daily requests to replace…

A: From the provided information, Mean (µ) = 53 Standard deviation (σ) = 6 Let X be a random variable…

Q: The physical plant at the main campus of a large state university recieves daily requests to replace…

A: Given Mean =61 Standard deviation=8

Q: A​ fruit-packing company produced peaches last summer whose weights were normally distributed with…

A: Using normalisation technique.

Q: In a mid-size company, the distribution of the number of phone calls answered each day by each of…

A:

Q: The physical plant at the main campus of a large state university recieves daily requests to replace…

A: According to the given information, we have Mean = 50 and Standard deviation = 10

Q: The physical plant at the main campus of a large state university recieves daily requests to replace…

A: We first find the z scores of 52 and 79 z score of 52=52-529=0z score of 79=79-529=3 This means we…

Q: Suppose the average golfer drives the ball around 259.1 yards with a standard deviation of 9.73.…

A: Solution

Q: . The most recent American Time Use Survey, conducted by the Bureau of Labor Statistics, found that…

A:

Q: An advocacy group claims that the mean braking distance of a certain type of tire is 75 feet when…

A: According to the provided information,

Q: A Human Resource Trainer in a company claims that a trained workers should be able to finish an…

A: A hypothesis which is tested for plausible rejection is called the Null Hypothesis (typically…

Q: The physical plant at the main campus of a large state university recieves daily requests to replace…

A:

Q: The physical plant at the main campus of a large state university recieves daily requests to replace…

A: Given,   Mean = 56 Standard deviation = 10   The objective is to find the percentage of light bulb…

Q: The physical plant at the main campus of a large state university recieves daily requests to replace…

A: Empirical rule: The empirical rule states that, About 68% of the data values lies within 1 standard…

Q: A sports science group claims that due to improved training methods, professional cyclists burn a…

A:

Q: A banker studying customer needs finds that the number of times people use automated-teller machines…

A: Ans:  Given,  X ~ N( μ, σ )          Where  μ  = 40    and  σ = 11.4          Find   P( 45 < X…

Q: In a mid-size company, the distribution of the number of phone calls answered each day by each of…

A:

Q: The time required for a citizen to complete the 2000 U.S Census "long" form is normally distributed…

A: A z-score represents the position of a data point in terms of its distance from the mean when…

Q: The physical plant at the main campus of a large state university recieves daily requests to replace…

A:

Q: A random sample of 100 women each from the rural and urban  areas showed the following mean and…

A: Null Hypothesis: A hypothesis which is tested for plausible rejection is called the Null Hypothesis…

Q: A Japanese shoe company investigates the foot lengths of young men to help predict the number of…

A:

Q: The maintenance department at the main campus of a large state university receives daily requests to…

A: Given Information: Mean (x) = 36  Standard deviation (s) = 5  The percentage of lightbulb…

Q: In a mid-stze company, the distribution of the number of phone calls answered each day by each of…

A:

Q: A sample of 106 body temperatures was found to have a mean of 98.20and a standard deviation of 0.62.…

A: Given that, A sample of 106 body temperatures was found to have a mean of 98.20and a standard…

Q: Assume that military aircraft use ejection seats designed for men weighing between 140.6 lb and 210…

A: Obtain the percentage of women have weights that are within those limits.   The percentage of women…

Q: A college entrance exam company determined that a score of 23 on the mathematics portion of the exam…

A: The validity of the claim, i.e., if the mean test score is truly higher than 23 is to be tested at…

Q: The physical plant at the main campus of a large state university recieves daily requests to replace…

A: X~N(μ=48, σ=10) RESULT FOR EMPERICAL  P(-1<Z<1)= 68%  P(-2<Z<2)=95%…

Q: The physical plant at the main campus of a large state university recieves daily requests to replace…

A:

Q: ge only 7.8 minutes of leisurely reading per day with a standard deviation of 5.4 minutes. However,…

A: let for the age group 15 to 19 n1 = 975 μ1 = 7.8 s1 =5.4  let for people of age 75 n2 = 1050 μ2=43.8…

Q: The average salary for public school teachers for a specific year was reported to be $39485. A…

A: Solution-: Given: x¯=41650,μ0=39485,n=60,s=5980,α=0.05 We test the mean salary differs from $39485…

Q: what is the approximate percentage of lightbulb replacement requests numbering between 33 and 57?

A: We can use the fact that empirical rule suggest that within µ - 3σ and µ + 3σ 99.7% area of the…

Q: In a research report, Richard H. Weindruch of the UCLA Medical School claims that mice with an…

A:

Q: The government of an mpoverished country reports the mean age at death among those who have survived…

A: Denote μ as the population mean age at death among those who have survived tom adulthood.

Q: A Japanese shoe company investigates the foot lengths of young men to help predict the number of…

A: We know one of the three statement of empirical rule as: P  μ-2σ≤X≤μ+2σ = 0.95 i.e. P -2≤X-μσ≤2 =…

Q: large accounting firm is trying to determine what fee to charge for next year's returns in order to…

A:

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.