$ The prices of 25 pens (in) are given below:
21, 24, 40, 19, 18, 38, 36, 34, 37, 47, 30, 29, 45, 34, 25, 33, 12, 25, 32, 13, 41, 20, 26, 28, 22
2) Represent the data by a histogram with class interval 10-20, 20-30 .. and so on.
b) Find the percentage of pens whose prices are equal to or more than 30.
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