Example: 1, __ , 3, 4, 5; mean=3 Step 1: Let N be the missing number. 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:
3:7
7
3
4
7
3
7
Example:
2
6
+
1
2
1
6
2
3
5
6
Example: Convert
4
3
to a mixed number
3)
4
= 1 with remainder of 1.
The answer is the whole number part, the remainder is the numerator part, and the denominator is the same as the improper fraction.
Therefore,
4
3
= 1
1
3
Example: Find the median of the following: 1, 2, 1, 5, 5 Step 1: Sort the list → 1, 1, 2, 5, 5 Step 2: Count of numbers listed → 5 (odd) Step 3: So the middle number is (count+1)/2 → (5+1)/2 → 3rd number. Therefore, the median is 2.