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Question

The number of hours of classes attended by students in a semester and the corresponding number of students is tabulated below. Find the median number of hours of classes attended by the students.

Number of hours100−120120−140140−160160−180180−200Number of students192830167

A

128

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B

133

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C

138

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D

142

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Solution

The correct option is D

142


Class IntervalFrequencyCumulative Frequency10012019191201402847140160307716018016931802007100

N2=50
Median class is 140-160

M=L+N2c.ff×h=140+504730×20=142


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