Question

if mean of 50 observation is 70 .find the sum of the observation
explain step by step
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Answer 1

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Answer 2

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Old mean= sum of 50 observations/50

70*50= sum of observations

3500= sum

Now, 85 was wrongly read 60 therefore, we will need to add 15(85-60) to the sum of observations to get correct mean

Therefore, correct mean= (3500+15)/50

= 3515/50

=70.3

Therefore, 70.3 is the correct mean.

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