Three defective electric toothbrushes were accidentally shipped to a drugstore by Cleanbrush Products along with 17 nondefective ones.

Three defective electric toothbrushes were accidentally shipped to a drugstore by Cleanbrush Products along with 17 nondefective ones. a. What is the probability the first two electric toothbrushes sold will be returned to the drugstore because they are defective? Show all work, the formula and answer b.) What is the probability the first two electric toothbrushes sold will not be defective? Show all work, the formula and answer

A survey of top executives revealed that 35% of them regularly read Time magazine, 20% read Newsweek, and 40% read US News and World Report. Ten percent read both Time and US News and World Report.

A survey of top executives revealed that 35% of them regularly read Time magazine, 20% read Newsweek, and 40% read US News and World Report. Ten percent read both Time and US News and World Report. a)What is the probablility that a particular top executive reads either Time or US News and World Report regularly? Show the work and formula using excel. b)What is the probablity .10 called? Show the work and formula using excel. c)Are the events mutually exclusive? Explain. Mutually Exclusive -- Yes or No? Explain Answer:

A normal distribution has a mean of 50 and a standard deviation of 4.

A normal distribution has a mean of 50 and a standard deviation of 4. a) Compute the probability of a value between 44.0 and 55.0 Show your work and answer here excel format b) Compute the probability of a value greater than 55.0 Show your work and answer here excel format c) Compute the probability of a value between 52.0 and 55.0 Show your work and answer here excel format

According to an IRS study, it takes an average of 330 minutes for taxpayers to prepare, copy, and electronically file a 1040 tax form. A consumer watchdog agency selects a random sample of 40 taxpayers and finds the standard deviation of the time to prepare, copy, and electronically file form 1040 is 80 minutes.

According to an IRS study, it takes an average of 330 minutes for taxpayers to prepare, copy, and electronically file a 1040 tax form. A consumer watchdog agency selects a random sample of 40 taxpayers and finds the standard deviation of the time to prepare, copy, and electronically file form 1040 is 80 minutes. a)What assumption or assumptions do you need to make about the shape of the population? Give assumption(s): b)What is the standard error of the mean in this example? Show your work and answer here in excel format c)What is the likelihood the sample mean is greater than 320 minutes? Show your work and answer here in excel format d)What is the likeli... click for more

Chicken Delight claims that 90% of its orders are delivered within 10 minutes of the time the order is placed. A sample of 100 orders revealed that 82 were delivered within the promised time. At the 0.10 significance level, can we conclude that less than 90% of the orders are delivered in less than 10 minutes?

Chicken Delight claims that 90% of its orders are delivered within 10 minutes of the time the order is placed. A sample of 100 orders revealed that 82 were delivered within the promised time. At the 0.10 significance level, can we conclude that less than 90% of the orders are delivered in less than 10 minutes? Please answer the questions using the excel file provided. Questions are in excel spreadsheet , attached.