Assumed Mean Method
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Question 7
To 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:
Concentration of SO2(in pmm)Frequency0.00−0.0440.04−0.0890.08−0.1290.12−0.1620.16−0.2040.20−0.242
Find the mean concentration of SO2 in the air.
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Which test is used when the sample size is more than ?
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(ii) Find the mode. [3 MARKS]
The following data gives marks obtained by students in an exam.
MarksNo. of studentsAbove 080Above 1077Above 2072Above 3065Above 4055Above 5043Above 6023Above 7016Above 8010Above 908Above 1000
(i) Convert to a regular distribution.
(ii) Find the mode. [3 MARKS]
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The mean of is_____.