What do we understand by the word upper?
Recall the class mark formula and follow with corrosponding class marks.
By adding the width to the lower limit of a class you will get the lower limit of the next class or the upper limit of the same class.
What do you understand by the lower limit of any class interval?
Think about the difference between the upper limit of the first class and lower limit of the next class. And then divide it by 2.
By putting the values given in all the options, you can find the class mark and width of class.
Think about the numbers which can be grouped in the class 105-110.
Mid value of the class - (class width)/2
Class mark and width of the class, together can be used to find the class interval.
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