Securing online accounts and backing up critical data

Assignment Help Basic Statistics

Reference no: EM131821006

The report "New Study Shows Need for Americans to Focus on Securing Online Accounts and Backing up Critical Data" (PRNewswire, October 29, 2009) states that only 25% of Americans change computer passwords quarterly, in spite of a recommendation from the National Cyber Security Alliance that passwords be changed at least once every 90 days. For purposes of this exercise, assume that the 25% figure is correct for the population of adult Americans.

a. If a random sample of 20 adult Americans is selected, what is the probability that exactly 3 of them change passwords quarterly?

b. What is the probability that more than 8 people in a random sample of 20 adult Americans change passwords quarterly?

c. What is the mean and standard deviation of the variable x 5 number of people in a random sample of 100 adult Americans who change passwords quarterly?

d. Find the approximate probability that the number of people who change passwords quarterly in a random sample of 100 adult Americans is less than 20.

Reference no: EM131821006

Questions Cloud

Discuss legal and ethical implications of capital investment : Capital Budgeting, Taxes, and Ethics The U.S. tax law is complex. Sometimes the line between tax avoidance and tax evasion is not clear.

Discuss the rational model and the political model : Discuss the rational model and the political model of policy analysis. Provide examples and describe how client values influence policy analysis.

Where will you earn the higher rate of return : The 1 year interest rate on the Euros denominated bank deposit is 2.5%. Where will you earn the higher rate of return - Eurozone or Switzerland

What is the margin of safety in dollars : Hyde's Headphones sells deluxe headphones for $75 each. Unit variable expenses total $45. What is the margin of safety in dollars?

Securing online accounts and backing up critical data : The report "New Study Shows Need for Americans to Focus on Securing Online Accounts and Backing up Critical Data" (PRNewswire, October 29, 2009)

Discuss the responsibilities of intermediaries : Discuss the professional ethics and responsibilities of intermediaries, managerial responsibility and loyalty, and employee responsibilities to the community.

What are total fixed expenses : The selling price of a particular product is $85.00 per unit, the variable expense is $49.00 per unit, and the breakeven sales. what are total fixed expenses?

Direct-to-consumer advertising of prescription drugs : The article "Should Canada Allow Direct-to-Consumer Advertising of Prescription Drugs?" (Canadian Family Physician [2009]: 130-131) calls

Discuss the effect of the designation of the default outcome : Discuss the effect of the designation of the default outcome and the assignment of burden of proof in communicating priorities.

User Account

All Pages