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phone book has as its precursor the business directory, ca. 1795-1800, NYC, with names and addresses.

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12y ago

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What percent of Americans use technology?

50-60% of Americans uses technology today.


Why is it important to test a database?

Many applications today rely on a backend database in order to function. If the database is not working properly, then the entire application is typically inaccessible because so much information including logins are stored in the database. Databases should be tested for boundary conditions, stress, function, and structure to ensure that everything is working as designed.


There is a 80 percent chance of rain today and a 50 percent chance of rain tomorrow If the two events are independent what is the probability that it will rain today or tomorrow?

It is 1 - prob(it does not rain today and tomorrow)= 1 - prob(it does not rain today)*prob(it does not rain tomorrow) = 1 - [1- prob(it does rain today)]*[1 - prob(it does rain tomorrow)] = 1 - [1 - 0.8]*[1 - 0.5] = 1 - 0.2*0.5 = 1 - 0.1 = 0.9


What is the percent chance of finding gold today?

The percent chance of finding gold today varies widely based on factors such as location, geological conditions, and mining methods. In areas with a history of gold discovery, like certain regions in California or Alaska, the chances can be higher, potentially around 1-10% for recreational prospectors. However, in unexplored or less promising areas, the chances are significantly lower. Overall, while gold can still be found, it often requires significant effort, expertise, and sometimes luck.


There is a 20 percent chance of rain today and a 80 percent chance of rain tomorrow If the two events are independent what is the probability that it will rain today or tomorrow?

0.20 + 0.80*0.80