If four different subjects are assigned weights in an examination as Physics $(2)$,Chemistry $(1)$,English $(1)$,and Mathematics $(2)$,and a student scores $60$ in Physics,$70$ in Chemistry,$70$ in English,and $80$ in Mathematics,find the weighted mean.
- A$60$
- B$70$
- C$80$
- D$85$
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The following data gives the distribution of height of students. The median of the distribution is:
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| Height (in $cm$) | $160$ | $150$ | $152$ | $161$ | $156$ | $154$ | $155$ |
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$x_i$ $5$ $8$ $11$ $14$ $17$ $f_i$ $4$ $5$ $6$ $10$ $20$
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