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...2 shows how to calculate the ‘weighted mean’, which is a quantity related to the arithmetic mean. You will learn about some circumstances where it makes sense to calculate a weighted mean. Section 3 shows how to calculate one particular measure of spread for a batch: the ‘interquartile range’. It also shows some diagrammatic methods for representing the spread and...

...2 due to its similarities with a previously identified coronavirus (SARS-COV) that caused the outbreak of Severe Acute Respiratory Syndromes (SARS) in the early 2000s (for more information about what a virus is see this article on OpenLearn). SARS-CoV-2 causes the disease COVID-19. Compared with SARS, the new coronavirus SARS-CoV-2 seems to spread more easily within the...

...2 Give an alternative notation for labelling each of these angles in the diagram below. (a) α (b) β (c) (d) ACD Answer (a) or CAB. (b) or BCA. (c) γ or DAC. (d) δ or ...Geometry: 1.2 How to measure an angle - To measure an angle you need a protractor. The protractor shown here is a semicircle that is graduated to measure angles from 0° to 180°. It is also possible...

...2 and Table 1. [Described image] Figure 2 Typical analysis for a bottle of mineral water values shown in mg l-1. What will the [H+(aq)] be in the water in Figure 1? [pH equation left hand side equals right hand side minus log open open cap h super plus left parenthesis aq right parenthesis close divided by mol dm super negative three close] (Equation 1) Rearranging gives...

...2 ms-1 (Beaufort Scale 2) to 16 ms-1 (Beaufort Scale 7) by how many times will wind stress increase? Select here to reveal answer... The wind stress will increase by a factor of 64. 16 ms-1 is eight times 2 ms-1 so the wind stress will increase by eight squared which equals 64. The wind speed, and consequently the wind stress driving the waves, varies around the globe and...

...2 the method of separation of variables. Section 3 looks at applications of differential equations for solving real world problems. Section 4 introduces the integrating factor method for solving linear differential equations. The final two sections summarise and revise the methods introduced in the previous sections and describe various other approaches to finding...