Probability that at least 25 devices will work correctly

Assignment Help Basic Statistics

Reference no: EM131426417

Public Health and Nutrition Emergency defibrillators are now located in many public buildings. However, the U.S. Food and Drug Administration (FDA) is concerned about the reliability of these devices. Approximately 45,000 devices failed during the past seven years.41 Suppose the FDA claims that the probability of an emergency defibrillator working correctly is 0.90, and 30 of these devices are selected at random and tested.

a. Find the probability that exactly 28 devices will work correctly.

b. Find the probability that at least 25 devices will work correctly.

c. Suppose only 20 of the devices work correctly. Is there any evidence to suggest that the proportion of emergency defibrillators that work correctly has changed? Justify your answer.

Reference no: EM131426417

Questions Cloud

Project and includes the project scope document : A part of the project management plan that is the baseline of the scope of a project and includes the project scope document, WBS, and WBS dictionary best defines.

Various areas of a business organization to collaborate : 1. What are tradeoffs? Why is careful consideration of trade is-offs important in decision making? 2. Why is it important for the various areas of a business organization to collaborate?

Find probability that at least 18 calls will be successful : Find the mean, variance, and standard deviation of the number of successful calls.- Find the probability that at least 18 calls will be successful.

Estimate the npv of the acquisition : Finally , the balance sheet shows the firm to be composed of 25% debt, 10 % preferred , 55% equity (common plus retained), and 10% current liabilities. Current liabilities are assumed to be costless; therefore the WACC is 4.55%. Comment of this pr..

Probability that at least 25 devices will work correctly : Find the probability that exactly 28 devices will work correctly.- Find the probability that at least 25 devices will work correctly.

Universal and the contingency leadership theories : Describe the differences between the universal and the contingency leadership theories. Explain your answer in sufficient detail to demonstrate your understanding.

Dubrin basic formula for human behavior : What modifications would you make to DuBrin's basic formula for human behavior to account for why some leaders excel in creative positions and others do not? Present Dubrin's basic formula and describe your proposed modifications.

Conduct a du pont system analysis : Conduct the comparative analysis of company financial statement using common size tools (both vertical and percent change analysis). Once comparative analysis is complete discuss where company is performing better /weak in both balance sheet and i..

Probability that exactly 1 have no religious affiliation : What is the probability that exactly 1 officer will have no religious affiliation?- What is the probability that at most 2 officers will have no religious affiliation?

User Account

All Pages