A student's marks were wrongly entered as 83 instead of 63. Due to the error the average marks for the class got increased by 0.5. Find the number of students in the class.
বিকল্পসমূহ (নিজের উত্তর যাচাই করতে ক্লিক করুন):
সঠিক উত্তর
2 (40)
বিস্তারিত ব্যাখ্যা ও বিশ্লেষণ:
Solution:
Let the number of students in the class be x.
Total increase in marks = x × 1/2 = x/2
According to the question
⇒ x/2 = (83 - 63)
⇒ x/2 = 20
⇒ x = 40.
∴The total number of students in the class is 40.
