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In Class 12 Mathematics, under the Statistics chapter, students learn how to find and interpret the arithmetic mean of ungrouped data. The topic explains the direct method using the sum of observations divided by their number, along with suitable examples and notation. Students also practise calculating the mean accurately, using assumed-mean or deviation-based reasoning where helpful, and understanding how the mean represents the central value of a data set.
Easy · Level 1 · 1 questions
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Question 1EasyLevel 1
What is the mean of the data 5, 8, 11, 14, 17, 20?आँकड़ों 5, 8, 11, 14, 17, 20 का माध्य क्या है?
Correct answer:सही उत्तर:B
Arithmetic mean = sum of all observations ÷ number of observations. Here, the sum is 5+8+11+14+17+20 = 75, and there are 6 observations. Thus, the mean is 75/6 = 12.5, so option B is correct. Getting 11.5 would indicate an error in calculating the total or the number of observations. Exam tip: Check both the sum and the total number of observations before dividing.अंकगणितीय माध्य = सभी प्रेक्षणों का योग ÷ प्रेक्षणों की संख्या। यहाँ योग = 5+8+11+14+17+20 = 75 और प्रेक्षणों की संख्या 6 है। अतः माध्य = 75/6 = 12.5, इसलिए विकल्प B सही है। 11.5 लेने पर योग या प्रेक्षणों की संख्या की गणना में त्रुटि होगी। परीक्षा टिप: माध्य निकालते समय योग और कुल प्रेक्षणों की संख्या अलग-अलग जाँचें।
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