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Marks obtained by 7 students in a subject are $30,55,75,90$, $50,60,39 .$ The number of students securing marks less than the mean marks is $\quad$
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4
Given marks are $30,55,75,90,50,60,39$.
Mean marks $=y$ $\bar{x}=\frac{30+55+75+90+50+60+39}{7}=\frac{399}{7}=57$
Hence, 4 students secured marks less than the mean marks
Mean marks $=y$ $\bar{x}=\frac{30+55+75+90+50+60+39}{7}=\frac{399}{7}=57$
Hence, 4 students secured marks less than the mean marks
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