what is the answer of 9) number please solve and give the correct answer
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Answer:
58
Step-by-step explanation:
mean of 15 observations =50
sum of 15= 50×15= 750
mean of first 8=48
sum of first 8= 48×8=384
mean of last 8 = 53
sum of last 8 =53×8=424
8th observation = sum of first 8+sum of last 8-sum of all 15
424+384 -750 =58
hope this helps
Answered by
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Answer:
The eighth observation = 58
Step-by-step explanation:
Mean of 15 observations is 50
∴ Sum of 15 observations is 15x50 = 750
Mean of first eight observations is 48
∴ Sum of first 8 observations is 8x48 = 384
Mean of last eight observations is 53
∴ Sum of last 8 observations is 8x53 = 424
Adding first 8 and last 8 we get all 15 plus the Eighth Observation
∴ The eighth observation = (384 + 424) - 750 = 808 -750 = 58
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