allery6 টা সংখ্যাৰ গড় 8। যদি 12 সংখ্যাটো আঁতৰাই দিয়া হয়, বাকী 5 টাৰ গড় হ'ব:
A7
B7.5
C7.2
D8
Answer & Solution
Correct answer: C. 7.2
1. আটাইকেইটা ছটাৰে মুঠ যোগফল নিৰ্ণয় কৰা হ'ল: 8 x 6 = 48।
2. 12 আঁতৰোৱাৰ পিছত বাকী থকা মুঠ হ'ল 48 - 12 = 36।
3. পাঁচটা সংখ্যা বাকী থাকে।
4. গতিকে নতুন গড়টো হ'ল 36 / 5 = 7.2।
5. গড়টো হ্ৰাস পাইছে কাৰণ আঁতৰাই দিয়া সংখ্যাটো, 12, পুৰণি গড় 8 তকৈ বেছি আছিল।
_Source: syllabus Maths, Ch 13 'Statistics', S13.2 Mean of Grouped Data_
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