exam Maths Puzzle Numerical Ability

Q) A computerized switch board in the telephone exchange receives an average
of 4 calls/min . Find the probability that
(a) the interval of time between successive calls

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exam Other Question

Which of the following applies to the graph of 3x - y = 9?
The choices are:
m = -3, passes through (9, 0)
m = 3, y-intercept = -9
m = -3, x-intercept = -9
m = 1/3, passes through (0,-9) Show that the numbers is rational by writing it as a quotient of two intergers.

4. 0.37

Any help with this equation would be <b>GREATLY</b> appreciated.