Tales by Dots and Lines - Flash Cards
1/19
What is the mean?
The mean is the average of a set of values, calculated by dividing the sum of all values by the number of values.
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2/19
What is the median?
The median is the middle value of a data set when arranged in ascending order.
3/19
How do you calculate the mean?
To calculate the mean, add all values together and divide by the number of values.
4/19
What is the mean of 3 and 7?
The mean of 3 and 7 is (3 + 7) / 2 = 5.
5/19
What happens to the mean when a new greater value is added?
If a new value greater than the current mean is added, the mean increases.
6/19
What is the relation between mean and distances?
The mean is positioned such that the total distances of values below and above it are equal.
7/19
What happens to the mean if every value increases by 10?
The mean also increases by 10.
8/19
What happens to the mean when a value equal to it is removed?
Removing a value equal to the mean does not change the mean.
9/19
How does the median change when a higher value is added?
If a value greater than the median is added, the median can increase.
10/19
How do you calculate mean with frequencies?
Multiply each value by its frequency, sum these products, and divide by the total frequency.
11/19
How can you find a missing value using mean?
Set up the equation: (sum of known values + missing value) / total number of values = mean.
12/19
Calculate the mean of 42, 40, 39, 33.
The mean is (42 + 40 + 39 + 33) / 4 = 38.5.
13/19
What happens to the mean when a value lower than it is added?
When a value lower than the mean is added, the mean decreases.
14/19
How do you find the median from frequency data?
Add frequencies sequentially until you find the value at the median position.
15/19
What happens if all values are doubled?
The mean also doubles if all values in the set are doubled.
16/19
What does 'central tendency' refer to?
Central tendency refers to the measure that represents the center or typical value of a dataset.
17/19
Can there be more than one center in data?
No, there is only one center (mean) in the data as distances to values are balanced.
18/19
How do the mean and median differ?
The mean considers all data values, while the median is only concerned with middle values.
19/19
What is a common mistake when calculating mean?
A common mistake is not accounting for all values or their frequencies.
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