The cumulative frequency curve below illustrates the wait time of 240 customers who visited a bank. Use the graph to estimate
- (a)
the 60th percentile,
- (b)
the interquartile range of the wait time.
- (c)
Only 10% of the customers complained about the long wait time they experienced. What was the minimum wait time for these customers?
Answer ... minutes
- (d)
Two customers are chosen at random. Find the probability that one customer waited for less than or equal to 60 minutes and the other waited for more than 100 minutes.
Answer ...
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