the distance of 40 female engineers from their residence to their places of work were found as follows
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Solution--- The minimum and maximum km in the given raw data are 2 and 32 .It is given that 0----5 is one of the class intervals and class size is same.So, the classes of equal size are ....
0-5,5--10,10---15,15---20,20----25,25---30 and 30---35...
In this the upper limit of a class is not included in the class.In the class 0 to 5 of km .distance travelled by the engineer to their place of work ,an engineer who is to travel 5 km is not included in this class.He is counted in the next class engineers out of 40 lives at a distance not more Than 15 km from their resistance
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