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The five number summary for the length of duration (in minutes) of a volcano eruption is 1.7, 2.3, 4.0, 4.4, 5.2.

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Hi Vivian;
I like your name.
I am assuming that we are looking for figures longer than 2.3, and NOT equal to 2.3...
1.7, 2.3, 4.0, 4.4, 5.2
The last three are included in such category.
There are a total of 5 eruptions.
3/5
Percentage means that the denominator is 100.
Let's multiply the numerator and denominator by 20/20...
(3/5)(20/20)=60/100
60%
 
If we are including the figure of 2.3...
1.7, 2.3, 4.0, 4.4, 5.2
4/5
80%