A popular restaurant chain advertises that it delivers orders within 30 minutes. Suppose the average delivery time for one restaurant is 27 minutes with a standard deviation of three minutes. One particular order delivery took 35 minutes. What is the z-score for this delivery time? O -2.67 O -1.67 O 1.67 O 2.67

Q: A dpt store has a daily mean sales of $28,372.72. The standard deviation of sales is $2000. On…

A: Given: Daily μ=28372.72σ=2000 On Tuesday x=34885.21

Q: The towing capacities (in pounds) of all the pickup trucks at a dealership have a bell-shaped…

A: Given, The towing capacities (in pounds) of all the pickup trucks at a dealership have a bell-shaped…

Q: Es On their website, a property management company states that the mean monthly rent for apartments…

A: As per bartleby guideline expert have to answer first three subparts only dear student please upload…

Q: A pharmaceutical company claims that a drug is effective in treating 90% of people having severe…

A: It is given that the random variable follows a binomial distribution with n=6 and p=0.9.

Q: The We Go Farther Tire Company advertises a tire that lasts for 80,000 miles. The mileage for the…

A:

Q: A popular restaurant chain advertises that it delivers orders within 30 minutes. Suppose the average…

A:

Q: Do men take less time than women to get out of bed in the morning? The 42 men observed averaged 7.6…

A: Given , n1=42 , n2 =52  x¯1=7.6 , x¯2 =9 s1=2.2 , s2 =2.1 The hypothesis will be stated as below  H0…

Q: A marine researcher claims that the stomachs of blue crabs from one location contain more fish than…

A: From the provided information,

Q: A pharmaceutical company claims that a drug is effective in treating 90% of people having severe mig…

A: Given information: The percentage of people having severe migraine headaches is 90%. That is, p=0.90…

Q: Calvin, president of the company that makes Cocoa Bombs cereal, claims the weight of a box of Cocoa…

A: Hey there! Thank you for posting the question. Since your question has more than 3 parts, we are…

Q: The grade of OMG 321 was normally distributed with a mean of 81 and a standard deviation of 3.…

A: Let grade=X  X~N(μ=81, σ2=32) μ=81, σ=3 We want to find the P(X>80)= ?  Note: This probability…

Q: Rochester, New York averages μ = 21.9 inches of snow for the month of December. The distribution of…

A: Consider X be a random variable which, follows normal distribution, indicates the pay off by the…

Q: An accountant claims that he can complete a .1 standard tax return in under an hour with a standard…

A: From the provided information, Sample size (n) = 4 Sample mean (x̅) = 64 minutes Population standard…

Q: A tire manufacturer claims (based on years of experience with tires) that the mean mileage is…

A: Given: n= 101.0 ,x̄= 31000.0 ,s= 5000.0 µ= 35000.0 ,significance level(∝)= 0.02Now here using…

Q: The sizes of houses in Kenton County are normally distributed with a mean of 1369 square feet with a…

A: From the given information, the mean and standard deviation are 1,369 and 171.

Q: In a plant nursery, the owner thinks that the lengths of seedlings in a box sprayed with a new kind…

A: Given: n=80x¯=20μ0=26σ=10α=0.05

Q: A local chain of coffee shops is collecting data on the time each customer spends in line before…

A: The histogram shows the frequency of each number of minutes spent waiting in line.

Q: A snack company packages bags of popcorn with a mean weight of 55g and a standard deviation of 1g.…

A:

Q: The average number of acres burned by forest and range fires in a large New Mexico county is 4,300…

A: GivenMean(μ)=4300standard deviation(σ)=750

Q: A light bulb manufacture guarantees that that the mean life of a certain type of light bulb is at…

A:

Q: What is the standard deviation for the number of contacts in eight attempts?

A: Let , X be the number of attempt to reach a live person. Here , X has binomial distribution with…

Q: A laptop producer has been getting complaints on the batteries they install. Particularly, the…

A: Given that there are 10 over heating batteries in the batch of 30. The probability of overheating…

Q: An Internet provider contacts a random sample of 300 customers and asks how many hours per week the…

A:

Q: A car dealership looks back at their previous year’s sales records. Last year, the dealership sold…

A:

Q: Many families in California are using backyard structures for home offices, art studios, andhobby…

A: Let us consider X be a random variable which denotes the cost of shingled backyard structure which…

Q: A laptop producer has been getting complaints on the batteries they install. Particularly, the…

A: probability of overheating =P =9/20 =0.45 Let x be the random variable denoting the number of…

Q: The number of incoming students at two campuses of a midwestern university have historically been…

A: Given that the main campus incoming class has a mean of 3,916 and a standard deviation of 375.…

Q: A researcher was testing the number of pop corn kernels that popped out of a mini bag of 100 k after…

A: Let, X=the number of kernels popped. X has mean=72 and standard deviation=12

Q: A study tracked walking habits of 1136 randomly selected adults in the United States. The study…

A:

Q: In a plant nursery, the owner thinks that the lengths of seedlings in a box sprayed with a new kind…

A: We will conduct a two-tailed test. It is because the estimated mean height of seedlings can depart…

Q: that empty homes are not as appealing to buyers as staged homes and, therefore, sell for lower…

A: The following information has been provided: Sample Mean 1 (\bar X_1)(Xˉ1​) = 150000150000…

Q: Many families in California are using backyard structures for home offices, art studios, andhobby…

A: The known values are,  a) The z-score for a backyard structure costing $2300 is,

Q: A cement manufacturer claims that the average weight of his product is 40 kgs. with a standard…

A: Given: n= 45.0, x̄= 38.71 ,s= 2.35 µ= 40.0, significance level(∝)= 0.01 define hypothesis;- Null…

Q: What is the z-score of a value of 27, given a set mean of 24, and a standard deviation of 2?

A:

Q: to 29-year old woman is 64.1 inches tall, with a standard deviation of 3.9 inches. Who is relatively…

A:

Q: A popular restaurant chain advertises that it delivers orders within 30 minutes. Suppose the average…

A: Z=(x -mu ) ÷sigma

Q: What is the probability that the jewelry store will have to pay off on its promise?

A:

Q: Books in the library are found to have an average length of 350 pages with a standard deviation of…

A: Given that, Books in the library are found to have an average length of 350 pages with a standard…

Q: A laptop producer has been getting complaints on the batteries they install. Particularly, the…

A: There are 9 overheating batteries in the batch of 20 means that the proportion of getting the…

Q: HA manufacturer of Energy Saving Lamps has a product life that is normally distributed with a…

A:

Q: Is is unusual for someone to run a 4 minute mile if the mean time is 10.2 minutes and the standard…

A: From the provided information, Mean (µ) = 10.2 Standard deviation (σ) = 2.9 X~N (10.2, 2.9)

Q: The exam scores of 200 students are distributed normally with a mean of 72 and a standard deviation…

A: Total students = 200 Standard deviation = 10 And distribute mean = 72 We have to find the number of…

Q: A mechanic a brand of automobile tire that has a expectancy that is normally distributedwith a mean…

A: Let X be the random variable for the expectancy. X is normally distributed with a mean of 28,000…

Q: The sales representative for a manufacturer of a new product claims that the product will increase…

A: Given information: μ=29x¯=26n=15s=6.2

Q: A group of friends compares what they received while trick or treating. They find that the average…

A: Solution: Let X be the number of candies. From the given information, µ=43, σ= 2 and z-score is…

Q: Many families in California are using backyard structures for home offices, art studios, andhobby…

A: Hey there! Thank you for posting the question. Since your question has more than 3 parts, we are…

Q: he management of a national automobile manufacturer advertises a free transmission if it fails. The…

A:

Q: 4. Lindvall's Nursery has 25-pound bags of mealworms for sale. The bag filling process is known to…

A: Let X be the random variable such that mealworms for sale. x¯: The sample mean of mealworms for…

Q: Use z scores to compare the given values.   The tallest living man at one time had a height of 245…

A: The z-score of a random variable X is defined as follows: z = (X – µ)/σ. Here, µ and σ are the mean…

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.