say i have a class interval of 10. |80-90|90-100|100-110| the frequency of each class accordingly is, 4,4,17. how would i find the standard deviation of this grouped data? Would i find the mid points...

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say i have a class interval of 10. |80-90|90-100|100-110| the frequency of each class accordingly is, 4,4,17. how would i find the standard deviation of this grouped data? Would i find the mid points of the classes?

Answered Same DayDec 23, 2021

Answer To: say i have a class interval of 10. |80-90|90-100|100-110| the frequency of each class accordingly...

Robert answered on Dec 23 2021

130 Votes

Find the Standard deviation given class interval 80-90, 90-100,100-110
and frequency 4,4,17
Class Interval

Mid Point
m
Frequency
f
f*m m- (m- ² f(m- ²
80-90 85 4 340 -15.2 231.04 924.16
90-100 95 4 380 -5.2 27.04 108.16
100-110 105 17 1785 4.8 23.04 391.68
∑f = 25...

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say i have a class interval of 10. |80-90|90-100|100-110| the frequency of each class accordingly is, 4,4,17. how would i find the standard deviation of this grouped data? Would i find the mid points...

Answer To: say i have a class interval of 10. |80-90|90-100|100-110| the frequency of each class accordingly...

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