Question

the mean of 5 observation is 20 if four observation 30,40,15, 5 find the fifth observation ​

Answer 1

Answer:

10

Step-by-step explanation:

let x be the 5th obs

∴ (30 + 40+ 15 + 5 + x) / 5 = 20

   90 + x = 100

x= 10

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Answer 2

Answer:

the mean of 5 observation is 20 if four observation 30,40,15, 5 find the fifth observation