#25-1 February 14, 2011

Find the unit rate for the given ratio:1) 141 books in 3 classes

Find the mode of the given data2) 13, 18, 14, 18, 12

3) While looking around at a yard sale, Theresa found a table with a stack of Cds on it. The prices for the CDs are: $2.50, $3.00, $3.00, $6.00, $6.50, $7.50. What is the mean price of a CD at this yard sale?

Would using the MEAN be a good representation of the data?

Mean: 14.6

We ________ use the mean

because ________________

_______________________.

Mean: 14.6

We ________ use the mean

because ________________

_______________________

_______________________

_______________________.

Mean: 14.6

We ________ use the mean

because ________________

_______________________

_______________________

_______________________.

Feb. 14, 2011

A ______________________ is a measure that represents the

______ of a data set.

Feb. 14, 2011

Examples of measures of central tendency:

_______________

The Median

The ______ is the _____________ in an ordered set of data.

Step 1: List the numbers from ______ to _______.

Step 2 Identify the _____________ in the list.

Feb. 14, 2011

Miles Meg WalkedDay MilesMonday 4Tuesday 5Wednesday 6Thursday 1Friday 1

Feb. 14, 2011

Miles Meg Rode Her BikeDay MilesSunday 4Monday 6Tuesday 1Wednesday 2Thursday 1Friday 5Saturday 2

Feb. 14, 2011

Median Practice Feb. 14, 2011

The _____ is the number found by_______ aset of numbers and __________ the sum bythe number of addends.

The ________ is the ________ number in anordered set of data.

Step 1 List the numbers from ______ to ________.

Step 2 Identify the _______ number in the list.

Feb. 14, 2011

Monday Homework Feb. 14, 2011

Find the median of each data set

).7).9

).11

).8).10).12

Monday Homework Feb. 14, 2011

Circle the outlier for each data set.Find the MEAN for each data set with and without the outlier.Explain what effect the outlier had on the MEAN.

Mean:_____ Mean without outlier: _____Explain the change to the MEAN when you took out the outlier._________________________________________________________

Mean:_____ Mean without outlier: _____Explain the change to the MEAN when you took out the outlier._________________________________________________________

#25-2 February 15, 2011Are these rates equivalent?1)

Find the percent of the given number2) 8.3% of 75

3) A football team has linemen whose weights, in pounds, are: 295, 280, 290, 310, 335, 300, 345, 345

What is the median weight of the linemen?

chaperones5students25

chaperones13students52

FIND THE MODE♠ find which number is written the most

(occurs most often)

OR

♠ find the number that has the most X on the line plot (you may have more than one answer)

Feb. 15, 2011

Find the MODE• 4, 6, 6, 5, 4, 8, 9, 6

♠ find which number is written the most

THE MODE OF THIS SET OF NUMBERS IS

• How did you find your answer?

_______________________________________

_______________________________________

__

Feb. 15, 2011

LET’S DO ANOTHER ONE• 11, 19, 8, 11, 15, 8, 9

♠ find which number is written the most

THE MODE OF THIS SET OF NUMBERS IS______• How did you find your answer?

_______________________________________

_______________________________________

Feb. 15, 2011

Mode PracticeCircle the mode

Feb. 15, 2011

• 17, 17, 13, 14, 12, 11, 17 mode:__________• 20, 17, 15, 20, 18 mode:__________

• 3, 2, 2, 2, 0, 6, 1 mode:__________

• 5, 5, 7, 3, 2, 1 mode:__________

The _______ is the number that occurs __________.

Mode PracticeFeb. 15, 2011

Tuesday Homework Feb. 15, 2011

Find the mode of each data set

Tuesday Homework Feb. 15, 2011

Circle the mode of each chart

Can you find the mean and the median of the shirt color and talent show tables? Explain.____________________________________________________________________________

What is the MEDIAN age of the Little League players? (HINT: age 10 shows 3 so you would write: 10, 10, 10).

______________________

______________________

IF I replaced a black shirt with a pink shirt, would that change the mode? Explain.

______________________________________

______________________________________

#25-3 February 16, 2011Find the UNIT RATE1) A cyclist travels 109km in 4 hours

Find the mean of the given data2) 121, 118, 127, 121, 123, 126, 125, 124

3) The table below lists the top running speed, in miles per hour, for several animals. What is the median speed listed?

FIND THE RANGE ♠ find the __________ number and the __________ number

♠ __________

Range indicates how spread out the data is in a given data set.

Feb. 16, 2011

Range Examples

Largest Number: _____Smallest Number: _____Range (difference): _____

Largest Number: _____Smallest Number: _____Range (difference): _____

Feb. 16, 2011

• 4, 6, 6, 5, 4, 8, 9♠ find the __________ number and

the __________ number

♠ __________

THE RANGE IS: _____How did you find your answer? _________________

Range Examples Feb. 16, 2011

• 11, 19, 8, 11, 15, 8 ♠ find the __________ number and

the __________ number

♠ __________

THE RANGE IS: _____

Range Examples

How did you find your answer? _________________

Feb. 16, 2011

• 17, 17, 13, 14, 12, 11 __________• 20, 17, 15, 20, 18 __________

• 3, 2, 2, 2, 0, 6, 1, 0 __________

• 5, 5, 8, 7, 3, 2, 1, 1 __________

Range Practice Feb. 16, 2011

Range Practice

Find the range with the 30-year old. ______________

Find the range when the 30-year-old is replaced by the 15-year-old. _______________

How was the RANGE effected by the change? _______________________________________________________________________________________________________________________________________

Feb. 16, 2011

Wednesday Homework Feb. 16, 2011

Error in finding the median.________________________________________________________

Show how to correctly find the median.__________________________________________________________________

Error in finding the range.________________________________________________________

Show how to correctly find the range.__________________________________________________________________

Range: _______________

Range: _______________

Wednesday Homework Feb. 16, 2011

With the lowest scoreMean: ____Median: _____Mode: _____Range: _____

WithOUT the lowest scoreMean: ____Median: _____Mode: _____Range: _____

Explain the affect to the mean: ____________________________________Explain the affect to the median: ____________________________________

Explain the affect to the mode: ____________________________________

Explain the affect to the range: ____________________________________

#25-4 February 17, 2011Which is the better buy?1) 9 ounces of sliced turkey for $4.99/lb

13 ounces of sliced turkey for $6.69/lb

What is the range of the data?2) 69, 71, 71, 100, 85, 93, 61

3) The heights of the students in a 6th grade chess club are shown in the stem-and-leaf plot below. What is the mode height?

Mean: _____ (total ÷ 20)Median: _____(list out each roll and circle the 10 th and 11th numbers)

Mode: _____ Range: _____

Include: scale, scale label, data groups,label for data groups, title

Each person must role 20 times. You will have different data!

Feb. 17, 2011

               

               

               

               

               

               

               

               

Make your bar graph here for YOUR data!

Compare your mean, median, mode, range and graph with your partner.

What differences do you see? ____________________________________

____________________________________

____________________________________

____________________________________

Explain why you have these differences.____________________________________

____________________________________

____________________________________

____________________________________

Feb. 17, 2011

PAPER AIRPLANE CONTESTThursday Homework

PAPER AIRPLANE CONTEST               

               

               

               

               

               

               

               

____________________________________________________

Thursday Homework

#25-5 February 18, 2011Which truck has the better fuel economy1) Truck A: 393 miles on 25 gallons fuel

Truck B: 309 miles on 20 gallons fuel

Which one is GREATER?2) 1.267 _____ 12.67%

3) A patrolman is tracking the speeds of cars on the interstate one afternoon. The bar graph below show the speeds of some of the cars. What is the range of the car speeds?

Mean: ____Median: _____Mode: _____Range: _____Which measurement best representsthe data? Explain (Be very specific. Give reasons why the other measurements are not a good measureof the data.)_________________________________________________

_________________________________________________

_________________________________________________

_________________________________________________

_________________________________________________

Feb. 18, 2011

Mean: ____Median: _____Mode: _____

Which measurement was most affected by removing the outlier? Explain (Be very specific. Give details of each change!)

_________________________________________________

_________________________________________________

_________________________________________________

_________________________________________________

_________________________________________________

Remove the OUTLIER and recalculate your mean, median, and mode.

Feb. 18, 2011

1). Find the mean for the FOUR seasons.__________2). Compare that number to the goal of 400. (higher or lower)3). Determine which 2 answers choices can be eliminated. ___ and ___4). Check which answer choice that is remaining is accurate.Show ALL WORK to justify your answer choice!

Feb. 18, 2011

___ ÷ 7 = 5 mi/day

How many miles have you ridden? _____How many more do you need? ________

Feb. 18, 2011

Mean: ____Median: _____Mode: _____Which measurement best represents the data? Explain (Be very specific. Give reasons why the other measurements are not a good measure of the data.)________________________________

________________________________

________________________________

________________________________

________________________________

Which measurement best represents the data? Explain (Be very specific. Give reasons why the other measurements are not a good measure of the data.)________________________________

________________________________

________________________________

________________________________

________________________________

Mean: ____Median: _____Mode: _____

Feb. 18, 2011