Mean of 7, 9, 12, x, 4, 11 & 5 is 9. Find the missing observation: (a) 13 (b) 15 (c) 12 (d) None of these
Answers
Answered by
89
Answer:
(b) 15
Step-by-step explanation:
Given that ;
Mean of 7, 9, 12, x, 4, 11 & 5 is 9.
Sum of observations = 7 + 9 + 12 + x + 4 + 11 + 5
⇒ x + 48
No of observations = 7
We know that ;
Mean =
⇒ 9 =
⇒ 9 * 7 = x + 48
⇒ 63 = x + 48
⇒ x = 63 - 48
⇒ x = 15
Hence, the value of x is 15.
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Extra information -
What is Mean?
The average of a given set of numbers is called the Arithmetic mean, or simply the mean, of the given numbers.
Mean =
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TheInsaneGirl:
Great xD :Taaliyan:
Answered by
105
Heya!
_______________________________________________________________
We know that ,
=> Given Observations = 7, 9, 12, x, 4, 11 ,5
=> Sum of observations = 48 + x
→ Number of observations = 7
→ Given Mean = 9
★ Put these values in the formula ,
•°• x = 63 - 48
→ x = 15
___________
✔Hence Option (b) 15 is correct !!
_______________________________________________________________
_______________________________________________________________
We know that ,
=> Given Observations = 7, 9, 12, x, 4, 11 ,5
=> Sum of observations = 48 + x
→ Number of observations = 7
→ Given Mean = 9
★ Put these values in the formula ,
•°• x = 63 - 48
→ x = 15
___________
✔Hence Option (b) 15 is correct !!
_______________________________________________________________
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