Question

The mean of 20 observation is 54. If one observation 42 was misread as 24, Find the new mean​

Answer 1

Mean = No of observation

number of observation are 20 and mean is 54

So, sum of observation is 54 x 20 = 1080

So, correct mean = number of observation

So, 1080-24+42÷20.

= 1056+42÷20.

=1098÷20.

=54.9

Step-by-step explanation:

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