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Example: 1, __ , 3, 4, 5; mean=3
Step 1: Let us call the missing number N.
Step 2: We know, Mean = (Sum of all numbers)/(Number of numbers);
Therefore, Sum of all numbers = Mean x Number of numbers
→ 1 + N + 3 + 4 + 5 = 3 x 5 → N + 13 = 15 → N = 15-13 → N = 2
Example: What is twice the radius?
chord
diameter
circumference
Example: Find the range of the following: 1, 2, 4, 5, 5
Step 1: Sort the list → 1, 2, 4, 5, 5
Step 2: Highest number → 5; Lowest number → 1
Step 3: Difference between the highest and the lowest numbers in the list → 5 - 1 = 4. Therefore, the range is 4.
Example: 22
-22
>
=
<
Example:
3:7
7
3
4
7
3
7
Example: What is the coefficient of 2y?
Answer: 2
Note: Numerical coefficient is the numeral part in a term.
Example: -22
22
-22
-20
Example: 22
21
2
20
Example: -15, -5, -65, -68, -85
-85, -68, -65, -15, -5
-68, -65, -15, -5, -85
-15, -85, -5, -68, -65
Example: 4
3
Example:
red ball to blue balls
3:2
2:1
3:5
2:5
Example: 23 is equal to 3 x 3
TRUE
FALSE