Probability

• I will be able to understand

- Theoretical probability - Experimental probability

• HW • Worksheet

Problem

• At the fun fair, Ms . A has every student spin the spinner once. If the spinner lands on square, Ms. A will give SMIC dollars to students. If there are 100 students, how many students are expected to get SMIC dollars?

Theoretical Probability vs Experimental Probability

If you flip a coin 5,000 times, how many times you expect to get

heads? Do you think it will happen exactly that many times?

Sean dropped his buttered bread 200 times. It landed buttered side up 62

times. Estimate the probability, given as percent that next time Sean drops the bread it won’t land buttered side up?

Adding Probabilities

• Mutually Exclusive event:• - Issac and Kevin want to find the probability

of getting a sum of 5 or sum of 7 when two number cubes are tosses?

• -Roger will toss a number cube to get an even number or a prime number.

• Example 1 – Mutually exclusive event• Example 2 – Not an exclusive event

Solve

• Tow number cubes are tossed. Describe if the events are mutually exclusive. Then find each probability expressed as fraction.

- P(Sum of 4 of sum of 8)- P( even sum of odd sum)

Extension

• A bag contains n cards with counting numbers from 1 to n. The probability of choosing a card whose number is 10 or less is 0.4. How many cards are in the bag?

Closure

• - Probability• Theoretical versus Experimental• Mutually exclusive event