Question 1 - Page 110 - Mean and Median with Frequencies - Chapter 5 Class 8 - Tales by Dots and Lines (Ganita Prakash II)

Transcript

Question 1 - Page 110 What is the average family size of this class?Now, Mean = (𝑆𝑢𝑚 𝑜𝑓 𝑂𝑏𝑠𝑒𝑟𝑣𝑎𝑡𝑖𝑜𝑛𝑠)/(𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑂𝑏𝑠𝑒𝑟𝑣𝑎𝑡𝑖𝑜𝑛𝑠) Since there are frequencies, we take those into account So, our Mean becomes Mean = (𝟑 × 𝟑 + 𝟒 × 𝟏𝟏 + 𝟓 × 𝟗 + 𝟔 × 𝟕 + 𝟖 × 𝟏 + 𝟗 × 𝟏 + 𝟏𝟎 × 𝟏)/(𝟑 + 𝟏𝟏 + 𝟗 + 𝟕 + 𝟑 + 𝟏 + 𝟏 + 𝟏) = (9 + 44 + 45 + 42 + 8 + 9 + 10)/36 = 188/36 = 5.22 (approx.)