सांख्यिकी - L5 | पग विचलन विधि | Class 10 NCERT गणित (Ganit) | Chapter 14 | Amit Sir | Doubtnut

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The average age of 54 girls in a class was calculated as 14 yr. It was later realized that the actual age of one of the girls in the class was 10.5 yr but it was calculated as 13yr . What is the average age (round off) of the girls in the class ?

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The average age of 30 students of a class is 12 yr. The average age of a group of 5 of the students is 10 yr and that of another group of 5 of them is 14 yr. what is the average age of the remaining students ?

In a class of 10 girls and 20 boys, Jaya's rank is 4 among the girls and 18 in the class. What is Jaya's rank among the boys in the class? 1) Can't be determined 2) 16 3) 14 4) 15 5) None of these