Exercise 13.1 (Q3–Q9) | Class 10 Maths Chapter 13 Statistics | Mean of Grouped Data 🔥 | Faiz Sir

In this video, Faiz Sir (M.Sc. Maths with CS) explains Class 10 Maths Chapter 13 – Statistics (NCERT) in detail. This is the Part-3 / Last Part of Exercise 13.1, where all remaining questions (Q3 to Q9) are solved step-by-step using appropriate methods of finding Mean of Grouped Data. 📌 Topics Covered in this Lecture: Mean of grouped data (Direct / Assumed Mean / Step Deviation method) Finding missing frequency Mean of heartbeats, daily expenses, pocket allowance Mean in real-life data based questions Exam-oriented CBSE & NCERT pattern questions Complete explanation with proper table formation 📘 Questions Discussed (Exercise 13.1): ✔ Missing frequency using mean ✔ Mean heartbeats per minute ✔ Mean number of mangoes per box ✔ Mean daily food expenditure ✔ Mean concentration of SO₂ ✔ Mean absentee record ✔ Mean literacy rate 🎯 This lecture is very important for Board Exams, school tests, and concept clarity. 👉 Watch till the end for full understanding and exam tips. 👉 Like, Share & Subscribe to Infinix Classes Maths for more NCERT-based Maths videos. #class10maths #statisticsclass10 #Chapter13Statistics #Exercise13_1 #MeanOfGroupedData #cbseclass10 #ncertmaths #faizsir #infinixclasses #boardexam2025 #mathsbyfaizsir #StatisticsForClass10 #cbsemaths #ncertsolutions class 10 maths statistics, chapter 13 statistics class 10, exercise 13.1 class 10 maths, mean of grouped data class 10, statistics class 10 cbse, ncert class 10 maths statistics, class 10 maths by faiz sir, infinix classes maths, statistics exercise 13.1 solutions, mean questions class 10, grouped data mean cbse, class 10 board maths, सीबीएसई कक्षा 10 गणित, सांख्यिकी कक्षा 10, औसत निकालना, एक्सरसाइज 13.1 गणित, कक्षा 10 एनसीईआरटी गणित, बोर्ड परीक्षा गणित CHAPTER - 13 | STATISTICS | By: Faiz Sir, M. Sc. Maths with CS | Class – 10 | NCERT 3. The following distribution shows the daily pocket allowance of children of a locality. The mean pocket allowance is Rs 18. Find the missing frequency f. 4. Thirty women were examined in a hospital by a doctor and the number of heartbeats per minute were recorded and summarised as follows. Find the mean heartbeats per minute for these women, choosing a suitable method. 5. In a retail market, fruit vendors were selling mangoes kept in packing boxes. These boxes contained varying number of mangoes. The following was the distribution of mangoes according to the number of boxes. Find the mean number of mangoes kept in a packing box. Which method of finding the mean did you choose? 6. The table below shows the daily expenditure on food of 25 households in a locality. Find the mean daily expenditure on food by a suitable method. 7. To find out the concentration of SO2 in the air (in parts per million, i.e., ppm), the data was collected for 30 localities in a certain city and is presented below: Find the mean concentration of SO2 in the air. 8. A class teacher has the following absentee record of 40 students of a class for the whole term. Find the mean number of days a student was absent. 9. The following table gives the literacy rate (in percentage) of 35 cities. Find the mean literacy rate.