Question

the graph below shows the amounts of rainfall for six months.
rainfall amount (in mm)
(a) what was the least amount of rainfall in a month?
□ mm
(b) when did the greatest decrease in rainfall occur?
○ june to july
○ july to august
○ august to september
○ september to october
○ october to november

Explanation:

Step1: Identify the lowest point on the graph

By observing the graph, the lowest - point on the rainfall amount curve is at 40 mm in October.

Step2: Calculate the decrease between months

For June - July: $60 - 55=5$ mm (increase). For July - August: $75 - 60 = 15$ mm (increase). For August - September: $75-48 = 27$ mm (decrease). For September - October: $48 - 42=6$ mm (decrease). For October - November: $62 - 42 = 20$ mm (increase). The greatest decrease is from August to September.

Answer:

(a) 40
(b) August to September