Mrs. Ramsey
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Introductions
Syllabus
Calculators?
Water Taste Test 
Hand out books!
• Section 5.1
• How many of you think you can tell the
difference between the school’s water and
bottled water?
• Let’s do books in the meantime…
•Let’s test it!
• There will be three cups of water in front of you
and you will use the number that is already on
your desk to record your answers.
• Two of these cups have water from the school
and only one has bottled water.
• Remember the letter (found on the bottom of
your cup) that you think has the bottled water.
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• If you were to guess
prior to doing this
experiment, what do you
think the percentage is
that people choose the
bottled water correctly?
• Was our hypothesis
correct? Is it good
enough to say that we
can accurately choose
bottled water over tap
water?
• How many people did
get this right?
• What else could have
affected our results?
• A probability is a
number between zero
(never occurs) and one
(always occurs) that
describes the likelihood
of an event.
• An event is a subset of
the possible outcomes in
a chance process.
• The compliment of an
event is the opposite of
the event. That is, the
even does not happen.
Ex: Let W be the event that we predicted which cup had the bottled water.
P(W) =
PC(W) =
• The number of times an event happens is known as the
frequency of that event. Our frequency was ____
• The relative frequency is the value calculated by
dividing the number of times an event occurs by the
total number of times an experiment is carried out
(written as a fraction, decimal, or %). Our relative
frequency was ______
• Imagine that you were to flip a coin 10 times and write down
your results (use H for heads and T for tails)
• Flip a penny 10 times and record your results.
• Label your first list “predictions”
• Label your second list “actual”
• The probability of an event can be thought of as its
long-run relative frequency when the experiment is
carried out many times.
• Believers think that if you flip TTTTTT then the next flip of a coin
is more likely to be H. It is true that in the long run heads will
appear half the time. What is a myth is that future outcomes
must make up for any imbalance.
• Coins and dice have no memories!
• After 10,000 flips the result of the first six flips doesn’t matter.
• Fill out 2 Google forms on my website with your parents!
• Section 5.1 Homework: Pg. 293 (1-4, 7-12, 14-20, 23-27)
• There are videos of Mr. Suk teaching that are posted on my
website! If you watch them you might have help with your
homework…
• Section 5.2 homework: Pg. 309 (39-46, 49-56)
• Section 5.3 homework: Pg. 329 (63, 65, 67-78, 81, 83-88, 9496, 99-103)