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The following table given the marks scor...

The following table given the marks scored by 50 students in a 100 marks test of Mathematics.
`{:("Marks",0-20,20-40,40-60,60-80),("No of "3,12,18,10,7),("students",,,,):}`
A student is selected randomly from the class.
Find the probability that selected student has scored 60 or more than 60 marks.

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