Mean Deviation This is the average sum of the deviations from the arithmetic mean (i.e. the sum of the differences between the scores and the mean) divided by the total frequency. Example 1 Find the mean deviation in the following test scores, Score (x) Frequency (f) 95 1 85 1 80 1 75 4 70
Substitution Methods The method of solving “by substitution” works by solving one of the equations (you choose which one) for one of the variables (you choose which one), and then plugging this back into the other equation, “substituting” for the chosen variable and solving for the other. Then you back-solve for the first variable. Solve
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Standard Index Form Standard index form is also known as standard form. It is very useful when writing very big or very small numbers. In standard form, a number is always written as: a × 10 n a is always between 1 and 10. n tells us how many places to move the decimal point. Example
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Introduction We define the notation 22 as “two squared” or the square of two” or “two raised to the power of 2” and it means 2 x 2. i.e. 22 = 2 x 2 (i.e. 2 multiplied by itself in 2 places ) also 23 = 2 x 2 x 2 ( i.e. 2 multiplied
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Standard Form Here we will learn a form of writing numbers. We use the standard form to express very large and very small numbers e.g. 327,800, 000, or 0.000096. The standard form is written as a x 10n where a is a number between 1 and 10 and n is a +ve or –ve integer.
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