calculate mean by step - deviation method
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AnsWer. ʕ•ᴥ•ʔ -Step Deviation Method: Calculating the Mean by using Step Deviation Method. A= The middle value that is assumed as the mean for calculation, ∑i=1nfi= Sum of the frequencies given, can be denoted by N.
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Concentration of SO2 (in ppm) Frequency....
0.08−0.12 | 9
0.12−0.16 | 2
0.16−0.20 | 4
0.20−0.24 | 2
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Explanation:
x f a-x a-x/10=X Xf
55 8 - 20 -2 -16
45 7 - 10 -1 -7
a=35 6 0 0 0
25 5 10 1 5
15 4 20 2 8
=30 (-10)
mean= a+ sumationfX/summation f*10
35+(-10)/30*10
=35-3.33=31.67
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