Question: how to solve Exercise 4 (6 marks) A mail-order computer business has six telephone lines. Let x denote the number of lines in use at

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Exercise 4 (6 marks) A mail-order computer business has six telephone lines. Let x denote the number of lines in use at a specified time. Suppose the mass function of x is given by O X p(x]: 0.1 0.15 0.20 0.25 0.20 0.05 What is the missing probability when x = 6 telephone lines. Calculate the value of the mean of x. Calculate the value of the standard deviation of x. d) What proportion of this computer business will have at least 3 telephone lines in use? e) What proportion of this computer business will have at most 5 telephone lines in use ? ) For what proportion of this computer business will the number of telephone lines in use be within 1 standard deviation of the mean value

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