Final answer:
The number in the middle of points 7.2 and 7.9 on a number line is calculated by averaging the two, resulting in 7.55.
Step-by-step explanation:
To find the number that is exactly in the middle of two points on a number line, you need to calculate the average of those two numbers. In this case, the two points are 7.2 and 7.9. To find the middle number, add these two values together and then divide by 2.
The calculation would be: (7.2 + 7.9) / 2 = 15.1 / 2 = 7.55. Therefore, the number in the middle of the points 7.2 and 7.9 on the number line is 7.55.