In this lesson, we will learn how to calculate the standard deviation and coefficient of variation of discrete random variables.
Students will be able to
Q1:
The function in the given table is a probability function of a discrete random variable 𝑋. Find the standard deviation of 𝑋. Give your answer to two decimal places.
Q2:
Let 𝑋 denote a discrete random variable which can take the values 0,2,5and. Given that 𝑋 has probability distribution function 𝑓(𝑥)=𝑎6𝑥+6, find the standard deviation of 𝑋. Give your answer to 2 decimal places.
Q3:
Work out the standard deviation of the random variable 𝑋 whose probability distribution is shown. Give your answer to two decimal places.
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