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Tommorow's my test
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given that mean of 5 observation is 15 .
therefore the sum of observation = 15*5 = 75 .
given that the mean first 3 observation is 14 .
therefore the sum of observation is 14*3 = 42
given that the mean of last 3 observation is 17
therefore the sum of observation is 17 * 3 = 51
hence ,
the third observation = (42 + 51 ) -75
= 93- 75
= 18 answer
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