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The stem and leaf display’s advantage over the histogram is that we can see the actual observations rather than observations classified into different classes.
A survey was conducted to determine how students rated the quality of online classes. Students were asked to rate the overall quality from 0% (no quality at all) to 100% (extremely good quality). The stem-and-leaf display of the data is shown below.
What percentage of the students rated overall quality of online classes with a rating of 70% or above?