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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...

Answered by Tanush M. • Maths tutor

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The first 4 terms of a different sequence are: 9, 13, 17, 21. Find an expression for the nth term of the sequence.

To tackle sequence questions like this you first have to find the difference between each term of the sequence and this number will go in front of the 'n'. Then to find the full expression, you have to...

Answered by Tanush M. • Maths tutor

12629 Views

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 tw...

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 tha...

Answered by Adam D. • Maths tutor

13542 Views

Solve algebraically: 6a+b=16, 5a-2b=19

To solve these simultaneous equations, you must add/subtract both equatons from each other to eliminate one variable, allowing you to work out the value of the other.

As you can see from ...

Answered by Tanush M. • Maths tutor

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