In the class of $45$ students, absentees in a particular week shown by the pictograph:
Read the pictograph and tell on which day(s) was the number of absentees a prime number?

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Solution

Lets first make a frequency column in the given pictogram:
scale:=1 absentee
Number of students absent on Monday $= 0$
Number of students absent on Tuesday $= 3$
Number of students absent on Wednesday $= 5$
Number of students absent on Thursday $= 9$
Number of students absent on Friday $= 7$
Number of students absent on Saturday $= 10$
Prime numbers are those numbers whose factors are one and themselves.
so, according to the data, we have the number of absentees prime number are on Tuesday, Wednesday, Friday
So, on Tuesday, Wednesday, and Friday prime number of students were absent .

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