Consider an arrival process whose interarrival times are independent exponential random variables with mean (and consequently variance equal to ), and consider the interarrival interval seen by an observer who arrives at a fixed time , as in the preceding video. What is the variance of

Suppose that the price p, in dollars, and the number of sales, x, of a certain item follow the equation 4 p plus 4 x plus 2 pxequals56. suppose also that p and x are both functions of time, measured in days. find the rate at which x is changing when xequals2, pequals6, and startfraction dp over dt endfraction equals1.5.