The mean of 5 observations is 15. If mean of the first three observations is 14 and that of the last three is 17, find the third observations
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Step-by-step explanation:
It is given that Mean of 5 observations is 15.
∴ The sum of observations =15×5=75.
∴ It is given that mean of the first 3 observations is 14.
∴ The sum of first three observations =14×3=42.
⇒ Given that mean of the last 3 observations is 17.
∴ The sum of the last three observations =17×3=51
∴ The third observation =(42+51)−75
=93−75
=18
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Answer:
18
Step-by-step explanation:
mean of 5 observation = 15
15 x 5 = 75
3 observation = 14
14x3= 42
Last 3 observation = 17x3 = 51
third = ( 42 + 51 ) - 75
= 93 - 75 = 18. ans
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