Statistics-And-Probability Question 649
Question: The mean of 13 observations is 14. If the mean of the first 7 observations is 12. And that of the least 7 observations is 16, what is the value of the 7th observations?
Options:
A) 12
B) 13
C) 14
D) 15
Show Answer
Answer:
Correct Answer: C
Solution:
[c] Total sum of 13 observations $ =14\times 13=182 $ Sum of 14 observation $ =7\times 12+7\times 16 $ $ =84\times 112=196 $ So, the 7th observation $ =196-182=14 $
BETA
