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hi there now in this video Iamp;#39;m just going to be looking at Part D the probability of getting values from a probability density function if you want to check out parts a B or C then Iamp;#39;ve done videos earlier on these the answers here though for B and C are 2 and 4/5 respectively just in case you need them for Part D so if youamp;#39;d like to have a go at this question havenamp;#39;t seen it before just give you a moment to pause the video when you come back Iamp;#39;ll take you slowly through the work solution ok welcome back then if you had a go now to appreciate this question I feel that weamp;#39;ve got to go back and draw the probability density function and I did that in Part B and this is what we got it was an inverted parabola going between naught and 4 and because of the symmetry of it we found out that the mean was in the middle here and it was 2 so when it comes to working out the probability that a randomly chosen as customers queuing time will differ from