This document provides examples of calculating probabilities for different events using percentages. It explains that an event that has a 0-49% chance of occurring is unlikely, 50% is equally likely as not, 51-99% is likely, and 100% is certain. Several examples are given of calculating experimental probabilities by dividing the number of times an event occurred by the total number of trials.

2. Impossible As likely as not Certain
Unlikely Likely
________________________________________________________________________
0% 50% 100%
0% = impossible
1- 49% = unlikely
50% = as likely as not
51 – 99% = likely
100% = certain
Experimental probability =
# 표푓 푎푛푠푤푒푟푠 푦표푢 푤푎푛푡
# 표푓 푝표푠푠푖푏푙푒 푎푛푠푤푒푟푠

3. 1) Jake rolls a number less than 7 on a number cube.
2) February will have 30 days.
3) A tossed coin will land on tails.
4) Shayla correctly guesses a number between 1 and 100.

4.  Gavin rolls an even number on a number
cube.
 In the northern hemisphere, the temperature
will get above 90° in the month of July.
 The first person that Sonya meets is a left-handed
person.
 A player with a batting average of .875 gets a
hit on his next at bat.

5. If a player gets 8 hits in 25 at bats, what is
the probability that he will get a hit on his
next at bat?

6. A piston manufacturer is concerned with the likelihood of
defects, as this affects costs and profits. The manufacturer
inspects 250 pistons and finds that 8 have defects.
1) What is the probability a piston will have a defect?
2) If the same manufacturer produces 3000 pistons, about how many will likely
have defects?
3) Pistons sell for $35 and it costs $25 in materials to make each piston. How
much profit would the manufacturer likely make on 3000 pistons if defective
ones cannot be sold?

7.  In Groups of 2, decide who is the drawer
and who is the recorder.
 You will need a whiteboard with the
following table drawn:
Color Tally Frequency Percentage
Red
Blue
Green
Yellow

8. Color Frequency Percentage
Red
Blue
Green
Yellow

9. Jamie spun a game spinner and
recorded the results in the table.
1. What is the probability of
landing on A? B? C?
2. Which letter will Jamie most
likely spin?
Outcome Frequency
A 9
B 6
C 10

10.  If a baseball player has 18 hits in 50 at
bats, what is the probability that he will
get a hit in his next at bat? (% and word)