Question 3 - A-Level Maths

3 At a place where a river is 7.5 m wide, its depth is measured every 1.5 m across the river. The table shows the results.

Distance across river \(( \mathrm { m } )\)	0	1.5	3	4.5	6	7.5
Depth of river \(( \mathrm { m } )\)	0.6	2.3	3.1	2.8	1.8	0.7

Use the trapezium rule with 5 strips to estimate the area of cross-section of the river.