The report New Study Shows Need for Americans to Focus on Securing Online Accounts and Backing up
Question:
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 = 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.
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Related Book For
Statistics The Exploration & Analysis Of Data
ISBN: 9780840058010
7th Edition
Authors: Roxy Peck, Jay L. Devore
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