## Statistics Tutorial

*Probabilty- For Grade 11-Revision*

#### Intro

This probability tutorial is ideal for Grade 11 and for those who are sitting for O/L examination in Maths. It is a revision paper for the lesson “probability”

#### Sample Problem

One pencil is selected at random from a box containing 2 red pencils, 5 blue pencils and 4 green pencils. Find the probability of selecting a red pencil or a blue pencil

#### Solution

Probability of getting a red pencil= 2/11

Probability of getting a blue pencil= 5/11

Therefore probability of getting a red OR a blue pencil = 2/11 + 5/11

= 7/11

# About The Author

Online Maths Tutor |

I am a MBA, BSc ( Mathematics) degree holder from University of Colombo, Sri Lanka. I complete any task given to me with dedication meeting deadlines. I have more than 10 years teaching experience in Mathematics. a good communicator & a presenter produced excellent results.Has produced 100% p... |