A group of 200 people estimated the time, \(t\) minutes, they spent at an exhibition. The cumulative frequency diagram represents their estimates.
Use the diagram to find the estimated interquartile range of the estimated times.[2]
One of these people is chosen at random. The probability that the person’s estimate is greater than \(t\) minutes is \(\dfrac45\). Find the value of \(t\).[2]
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