Saved Bookmarks
| 1. |
Q26 Find the mean of the following distribution:Classes10 - 1212-1414-1616-18Frequency4213 |
|
Answer» Step-by-step explanation: Class Interval MID Value x i
Frequency i
f i
x i
11 - 13 12 3 36 13 - 15 14 6 84 15 - 17 16 9 144 17 - 19 18 13 234 19 - 21 20 f 20 f 21 - 23 22 5 110 23 - 25 24 4 6 ∑f=40+f ∑fx=704+20f Given : Mean =18 We know, Mean ( x )= Σf Σfx
⟹18= 40+f 704+20f
⟹18(40+f)=704+20f ⟹720+18f=704+20f ⟹720−704=20f−18f ⟹2f=16 ⟹f=8 |
|