The table shows the mark obtained by students in a test.<...
The table shows the mark obtained by students in a test.
| Marks | 1 | 2 | 3 | 4 | 5 |
| Frequency | 2 | k | 1 | 1 | 2 |
4
1
2
3
Correct answer is B
x̄ =∑fx∑f=3
=(1×2)+(2×k)+(3×1)+(4×1)+(5×2)2+k+1+1+2=3
=2+2k+3+4+106+k=3
=19+2k6+k=3
=19+2k6+k=31
=19+2k=3(6+k)
=19+2k=18+3k
=2k-3k=18-19
=-k=-1
∴k=1
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