Q. 84.3( 216 Votes )
A class teacher has the following absentee record of 40 students of a class for the whole term. Find the mean number of days a student was absent
Answer :
The above given data can be represented in the form of table as below:
Mean can be calculated as follows:
and, xi = midpoint of the ith class
= 12.4 (approx.)
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PREVIOUSTo find out the concentration of SO2 in the air (in parts per million, i.e., ppm), the data was collected for 30 localities in a certain city and is presented below:
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