Probability. Probability is the chance that something will occur or happen. Probabilities are written as fractions, decimals, or percents. Probability.

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Presentation transcript:

Probability

Probability is the chance that something will occur or happen. Probabilities are written as fractions, decimals, or percents. Probability is always between 0 and 1. 0 – means an event CANNOT happen 1 – means an event will ALWAYS happen

0 0% % 1 100% Impossible As likely as notCertain

State whether each event is impossible, likely as not, or certain to happen. You roll an even number on a standard number cube. February has 28 days this year. This spinner lands on blue. This spinner lands on an odd number. RED GREENBLUE

To find the actual probability of an event occurring – use the following formula: what you want to have happen what can actually happen

For one month, Mr. Jones recorded the time at which his train arrived. He organized his results in a frequency table. Time6:50 – 6:526:53 – 6:566:57 – 7:00 Frequency785 Find the probability of the train arriving between 6:57 and 7:00. Find the probability of the train arriving before 6:57.

The spinner below was spun. Identify the outcome show. P(dog ) P(hamster ) P(dog or cat) P(bird) P(mammal) dog hamster cat

What is the probability of rolling a number greater than 4 on a fair number cube? What is the probability of rolling a factor of 6 using a fair number cube? What is the probability of rolling a multiple of 3 using a fair number cube?

What is the probability of tossing a coin and not landing on tails? What is the probability of rolling a number cube and not landing on an even number? If the probability of spinning a spinner and landing on blue is 3/5, what is the probability of not landing on blue?

A card is chosen at random. Find the probability of each. Write your answer as a fraction, decimal, and percent. A B S O K R Q E P (B) P (Q or R) P (vowel) P (consonant or vowel) P (consonant or A) P (T)

Suppose there is a 45% chance of snow tomorrow. What is the probability that it will not snow? Write this as a decimal and a fraction. Suppose there is a 2% chance of winning the lottery. What is the probability of not winning the lottery written as a fraction?

The End!