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The mean of the following distribution is 18. Find the frequency f of the class 19 – 21.
The class mark of the median class of the following data is :
The class mark of the class 90-120 is
In a frequency distribution, the mid value of a class is 10 and the width of the class is 6. The lower limit of the class is
A teacher is a person whose professional activity involves planning, organizing, and conducting group activities to develop student's knowledge, skills, and attitudes as stipulated by educational programs. Teachers may work with students as a whole class, in small groups or one-to-one, inside or outside regular classrooms. In this indicator, teachers are compared by their average age and work experience measured in years. For the same in 2015, the following distribution of ages (in years) of primary school teachers in a district was collected to evaluate the teacher on the above-mentioned criterion.
The class marks of the median class of the following data is
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