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# Counting Events

## And' means multiply

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.
• Video

## Probability Part 3

by CK-12 //basic
Learn how to write out all the possible outcomes of a tree diagram by hand and how to calculate the probability of an outcome.
MEMORY METER
This indicates how strong in your memory this concept is
3
• Real World Application

## Lightning Strikes

by CK-12 //basic
Find out your chances of holding the world record for lightning strikes.
MEMORY METER
This indicates how strong in your memory this concept is
0