s1 - histograms

You can't do that since by shifting the value of the range in daily income by £50, you are decreasing the overall value, since the interval between 3000-3500 has a smaller area than 2000-3000.

Since the small squares are equal to 5. In interval between 2000-3000 has an area of 16, and the area between 3000-3500 has an area of 12. From here it should be simple arithmetic.

How would you do it?

The area between 2000-3000 is 16*5, and the area between 3000-3500 is 12*5.

You need to find the area of 2700-3000 and 3000-3200 independently as they are part of different areas of the histogram.

Answer:

you need to sort out the vertical scale. then draw vertical lines at 2700 and 3200. now find the areas of the new rectangles from 2700 to 3000 and from 3000 to 3200. Add these areas together and you should get 48.

You can't do that since by shifting the value of the range in daily income by £50, you are decreasing the overall value, since the interval between 3000-3500 has a smaller area than 2000-3000.

Since the small squares are equal to 5. In interval between 2000-3000 has an area of 16, and the area between 3000-3500 has an area of 12. From here it should be simple arithmetic.

What you did isn't legitimate because the interval of 2700-3200 exists between 2 different areas, if it was to exist within one single area, then what you did wouldn't cause any problems (although I wouldn't recommend that you use it).