1 .	From a series of 50 observations, an observation with value 45 is dropped but the mean remains the same. What was the mean of 50 observations?
[ A ]    50 [ B ]    49 [ C ]    45 [ D ]    40
Answer : Option C Explanation : Let the observation mean = x ∴ Sum of 50 observations = 50x According to question ∴ $50x-45\over49$ x => 50x-45=49x ∴ x= 45
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