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The probability function of a discrete random variable X is given by p(x)=x^2 x =1,2,3. Find E(X)

The expectation of x, E(X), is the sum of the product of the value of the i th outcome (x i ) and the probability of the i th outcome (p i ). So: E(X)=1+(4 2)+(9 3)=36
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Answered by Tanush M. • Maths tutor
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Find the solution to ln(3)+ln(x)=ln(6)

To tackle this question, you will need to know about the rules for logarithms. Here we are going to use the product rule, where the addition of these two natural logarithms equals the product of the two comp...
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Answered by Tanush M. • Maths tutor
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How do you use trigonometry to work out angles and lengths of sides in a right angle triangle

Using the trigonometric(trig) ratios of cosine, sine and tangent we can work out side lengths and angles. Within a right angle triangle of we are given a side lenght and a angle other than the right angle we...
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Answered by Adam D. • Maths tutor
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Find the derivative for y=5x^3-2x^2+7x-15

To find the derivative, you look at each term and multiply the constant in front of the x by the power of x. Also you must lower the power of x by one after this step. So 5x 3 would be differentiated to 15x ...
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Answered by Tanush M. • Maths tutor
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How do I draw and sketch an equation?

Graph sketching can look like an intimidating process at times, but is easily broken down into a collection of fairly easy stages. In summary: Factorise the equation - Find the roots/intersections of the equ...
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Answered by Brad D. • Maths tutor
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