Marks of 12 students in a unit test are given as 4, 21, 13, 17, 5, 9, 10, 20, 19, 12, 20, 14.
Assume a mean and calculate the

1 thought on “Marks of 12 students in a unit test are given as 4, 21, 13, 17, 5, 9, 10, 20, 19, 12, 20, 14.<br />Assume a mean and calculate the”

1. Answer:

   Answer

   Let assumed mean be 13

   ∴ Arithmetic mean =13+

   12

   (4−13)+(21−13)+(13−13)+(17−13)+(5−13)+(9−13)+

   (10−13)+(20−13)+(19−13)+(12−13)+(20−13)+(14−13)

   =13+

   12

   8

   =13+0.67

   =13.67

   Now let assumed mean be 14

   ∴ Arithmetic mean =14+

   ⎣

   ⎢

   ⎢

   ⎢

   ⎢

   ⎡

   14

   (4−14)+(21−14)+(13−14)+(17−14)+(5−14)+(9−14)+

   (10−14)+(20−14)+(19−14)+(12−14)+(20−14)+(14−14)

   ⎦

   ⎥

   ⎥

   ⎥

   ⎥

   ⎤

   =14+[

   12

   −4

   ]=13.67

   Yes, 9 got the same result.

   Step-by-step explanation:

   PLS FOLOW ME

   MARK ME AS BRAINLIEST

   Reply