Venn Diagrams.. I need the theories

• Feb 22nd 2006, 10:28 AM
Arbitur
Venn Diagrams.. I need the theories
Could somebody answer these questions for me and give me the original formula...My online course did a terrible job on this section.. they dont tell you how to solve anything.
• Feb 22nd 2006, 10:48 AM
earboth
Quote:

Originally Posted by Arbitur
Could somebody answer these questions for me and give me the original formula...My online course did a terrible job on this section.. they dont tell you how to solve anything.

Hello

to 14. 5 students don't have any specific signs, that leaves you with 40 student who could be tall or haired or both. The sum of 28+19 = 47. That means there are 7 students who are tall and haired. Than there are 28-7=21 who are haired but midgets and 19-7=12 who are tall (but bold).

I've attached a Venn diagram (for further information you may look at Euler diagram) to demonstrate the result.

Next problem will follow (I haven't much time now)

Greetings

EB
• Feb 22nd 2006, 11:02 AM
DenMac21
Second problem solution:

285 students attend both dances, so first dance attended 285 + 455 students and second attended 285 + 155. So total number of students who have been to both dances is 285+(455+155) which is 895 students.
Totally 605 students did not attend both dances.