The average of 8 numbers is 8. If 4 is subtracted from each of 6 of these numbers, what is the new average?
ক) 3.5
খ) 5
গ) 4
ঘ) 6.5
বিস্তারিত ব্যাখ্যা:
প্রথমে, ৮টি সংখ্যার গড় ৮ হলে, সংখ্যাগুলোর মোট যোগফল হয় ৮ × ৮ = ৬৪। এখন, ৬টি সংখ্যা থেকে ৪ করে কমানো হলে মোট কমানো হয় ৬ × ৪ = ২৪। সুতরাং, নতুন যোগফল হবে ৬৪ - ২৪ = ৪০। যেহেতু সংখ্যা ৮টিই থাকছে, তাই নতুন গড় হবে ৪০ ÷ ৮ = ৫।
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