Madhyamik Question Paper Solution of Year 2018 Question No: 4.(xii)
একটি পরিসংখ্যা বিভাজনের গড় হলে 8.1 । \(\sum f_ix_i=132+5K\) এবং \(\sum f_i=20\) হলে, K -এর মান কত ?
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