Remember: Look at the dots first. A far dot pulls the mean, so use the median. Balanced dots let you use the mean.
Mean or median?
1
The mean is a good measure of the typical value here.
TrueFalse
2
Compare the mean of this data with its median.
The mean is lowerAbout the sameThe mean is higher
3
Why is the mean a poor choice for a typical value here?
One far dot pulls itThe mean is never a good pickThere are too many dots
4
The median is the middle of the dots. What is the median of this data? Answer:
5
The top plot is Class A and the bottom plot is Class B. Which class should use the median?
Class AClass B
Spread, too
6
Which number shows the spread of the typical kids in this data?
The IQRThe range
7
Join each situation to the best number.
1Balanced dots, no far dot
2One dot far from the rest
3Spread that goes with the mean
4Spread that goes with the median
Athe mean
Bthe IQR
Cthe MAD
Dthe median
8
One far dot changes the median a lot.
TrueFalse
9
Class A's scores are shown. What is the mean score? Answer:
10
The three dot plots are A on top, B in the middle and C at the bottom. Which one is a good place to use the mean?
ABC
Stretch
11
The data is 1, 2, 2, 3 and 12. Take away the far dot. What is the mean of the four dots left? Answer:
12
For the data 1, 2, 2, 3 and 12, would you report the mean or the median as the typical value? Write why.
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