Transcript probability & statistics activity

Bell Ringer
3-11-11
Valdemar has a spinner with the numbers 1 through 5.
would like to increase the chances of the following
events:
• Spinning an even number
• Spinning a number less than 4
• Spinning the square root of 9
Valdemar decides to remove the 5 from the spinner.
He
Which statement best supports his reasoning?
A. The number 5 takes up more space on the spinner.
B. Spinning the number 5 has the greatest probability.
C. The number 5 is the greatest number.
D. Spinning the number 5 is not a desired event.
Explain why you did not choose the other three answer
choices.
Valdemar has a spinner with the numbers 1 through 5.
Valdemar would like to increase the chances of the
following events:
• Spinning an even number
• Spinning a number less than 4
• Spinning the square root of 9
Valdemar decides to remove the 5 from the spinner.
Which statement best supports his reasoning?
A. The number 5 takes up more space on the spinner.
NO – Same chance as the others
B. Spinning the number 5 has the greatest probability.
NO – Same as the others
C. The number 5 is the greatest number.
TRUE – Would allow us to spin a number less than 4
D. Spinning the number 5 is not a desired event.
TRUE – 5 has nothing to do with ANY of the
criteria **Best Answer**
Quiz
3-11-11
4 different cylinders are placed in a
box. If a cylinder is randomly pulled
from the box, what is the probability
that the lateral surface area of the
cylinder will be greater than 86 cm2?
cylinder 1: r = 2 cm; h = 3 cm
cylinder 2: r = 2 cm; h = 4 cm
cylinder 3: r = 3 cm; h = 4 cm
cylinder 4: r = 3 cm; h = 5 cm
4 different cylinders are placed in a box. If a cylinder is randomly pulled
from the box, what is the probability that the lateral surface area of the
cylinder will be greater than 86 cm2?
cylinder 1: r = 2 cm; h = 3 cm
What is the probability cylinder 2: r = 2 cm; h = 4 cm
of getting a surface
cylinder 3: r = 3 cm; h = 4 cm
cylinder 4: r = 3 cm; h = 5 cm
area greater than 86
Lateral surface area
square centimeters?
cylinder1 : S  2(3.14)(2)(3)  37.68cm2
cylinder 2 : S  2(3.14)( 2)( 4)  50.24cm2
cylinder 3 : S  2(3.14)(3)(4)  75.36cm2
cylinder 4 : S  2(3.14)(3)(5)  94.2cm2
1
P( S  86cm )  or 25%
4
2
I found the surface area of each cylinder by
multiplying the pi by 2 and multiplying that
by the radius and height. I counted the
number of areas greater than 86. I wrote my
probability placing the number of areas
greater than 86 over the total number of
areas. I reduced.
There is a 25% chance of pulling a cylinder
with a surface area greater than 86 square
centimeters.
Speed Test
1. Get out a dry erase marker.
2. You have 1 minute to complete as
many problems as you can.
3.We will grade in 1 minute.
4. Graph your results. Keep the graph in
your notebook.
5. We will do this every day.
Problem of the Week &
Word Problem
#5-1
1. You have 5 minutes to work on the
problem of the week and word problem.
2. The problem of the week must follow
the Read, Think, Solve, Justify format.
3. When you are finished, turn them in.
4. They are due Friday.
Reach for the Stars
Friday
To cover his bulletin board, Mr. Adams needs 1½ yards
of fabric and 6¼ yards of trim. If the fabric costs
$2.79 per yard and the trim costs $1.19 per yard,
which equation can be used to find c, the total cost
of covering the bulletin board?
A.
B.
C.
D.
c
c
c
c
= (2.79 + 1.5) + (1.19 + 6.25)
= (2.79 · 1.5) + (1.19 · 6.25)
= (2.79 + 1.5) − (1.19 + 6.25)
= (2.79 · 1.5) − (1.19 · 6.25)
Class Work
Probability & Statistics
Smarties Activity
Answer the questions, pertaining to
your package of smarties.
Create the graphs.
Do NOT eat the candy until AFTER
you have gathered the data.