Bell Ringer  At a pet store there are 4 fish, 3 cats, 7 dogs, and 2 turtles for sale. 1) What is the probability that someone would take home a fish? 2) What is the probability that someone would not take home a turtle? 3) What is the probability that someone would take home a spider?

Today’s Agenda  1. Bell Ringer/HW  2. Mutually Exclusive Events  3. Inclusive Events  4. Socrative QC  5. Intro to Compound Events

Single Events  When a single event has more than one possible outcome (often shown using the word OR), we must ADD all possible outcomes together.  Example) The probability that a single die will roll a 2 or 3 is: 1/6 + 1/6 = 2/6 = 1/3

Mutually Exclusive Events When a single event has many possible outcomes that can never happen at the same time, they are said to be mutually exclusive. Example #1) Megan wants to roll a 2 or 3. Example #2) David wants to pick a king or queen. Example #3) Laura wants to land on orange or red.

Inclusive Events When a single event has many possible outcomes that can happen at the same time, they are said to be inclusive. Example #1) Megan wants to roll a 2 or an even. Example #2) David wants to pick a king or a red. Example #3) Laura wants to land on blue or a primary color.

Socrative Quick Check #1 The letters in the word PHILADELPHIA are placed in a hat. P(the letter D or a vowel) =

Socrative Quick Check #2 The letters in the word PHILADELPHIA are placed in a hat. P(the letter H or a consonant) =

Compound Events  When one event is followed by a second event, they are said to be compound events (often shown with the word AND or THEN). In these situations, we MULTIPLY their individual probabilities to find the total probability.  Example: Landing on Heads then TAILS ½ * ½ = ¼

What’s Your Grade? Green = A(1) Blue = B(2) Yellow = C(3) Orange = D(2) Red =E(1)