28 + 7 = 35
35/2 = 17.5
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The range of these numbers, the difference between the highest and lowest of these numbers, is equal to 28-15 = 13.
To find the number halfway between any two numbers x and y, add x and y, then divide the answer by 2. So for 21 and 35, 21+ 35 = 56. 56/2 = 28. You can check your answer by seeing that 21 + 7 = 28 and 35 - 7 = 28.
To find the length between 22cm and 50 cm: 50 cm - 22 cm = 28 cm.
Halfway between 18 and 28 is (18 + 28) ÷ 2 = 23.
Mean: 33.75 Median: 34 Mode: 28