Mathematics - Statistics Question with Solution | TestHub
MathematicsStatisticsRelation Between Variance and Mean DeviationMedium2 minPYQ_2024
MathematicsMediumsingle choice
The frequency distribution of the age of students in a class of 40 students is given below. If the mean deviation about the median is 1.25, then is equal to :
Options:
Answer:
C
Solution:
\begin{aligned} & \mathrm{x}+\mathrm{y}=10 \ldots \ldots \ldots .(1) \\ & \text {Median }=18=\mathrm{M} \\ & \text {M.D. }=\frac{\sum \mathrm{f}_{\mathrm{i}}\left|\mathrm{x}_{\mathrm{i}}-\mathrm{M}\right|}{\sum \mathrm{f}_{\mathrm{i}}} \\ & 1.25=\frac{36+\mathrm{x}+2 \mathrm{y}}{40} \\ & \mathrm{x}+2 \mathrm{y}=14 \ldots \ldots \ldots .(2) \\ & \text { by (1) & (2) } \\ & \mathrm{x}=6, \mathrm{y}=4 \\ & \Rightarrow 4 \mathrm{x}+5 \mathrm{y}=24+20=44\end{aligned}
Stream:JEESubject:MathematicsTopic:StatisticsSubtopic:Relation Between Variance and Mean Deviation
⏱ 2mℹ️ Source: PYQ_2024
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