Answer:
Use the following as guide:
Explanation:
For mean,
The mean or the average is calculated by getting the average of the set of numbers. We can do that by adding the given numbers and dividing them by the number of elements in that set.
Example;
Given: 20, 30, 40
To get the mean,
Step 1: Add them.
20 + 30 + 40 = 90
Step 2: Divide them by the number of elements they form.
In this case, we'll divide them by 3 since we only have 3 numbers by the given [that is 20, 30, 40]. So,
90/3 = 30
The mean or average is therefore 30.
The mean formula is
, or
For median,
The median or the middle value in the set of numbers.
in this set of values, the middle value is 30. That is when it's odd.
20, 30, 40
But what if the set of values is even, or like this? What value is the middle?
20, 30, 40, 50
By this we need to use the formula
Step !: Count the number of terms.
(In this case, we have four terms since 20, 30 , 40, 50 is only four)
median = 4 / 2 = 2 (or the second value on the set which si 30)
Step 2: Add the nth to its next number in the set.
30 + 40 = 70
Step 3. Divide it by 2.
70 / 2 = 35
Therefore, the median is 35.
For mode,
The mode or the most frequent number to appear is found by:
Step 1: Arranging the values in a set from lowest to highest order.
ex.
Given: 23, 12, 67, 12, 56
12, 12, 23, 56, 67
The most frequent therefore is 12; mode = 12.
But, if no numbers appear no more frequent than the others, then there is NO MODE.
ex 1.
Given: 23, 67, 12, 56
12, 23, 56, 67
ex 2.
Given: 1, 2, 1, 2, 3, 4, 3, 4
1, 1, 2, 2, 3, 3, 4, 4