Question

The mean of 20 observations is
54 if one observation 42 is
misread as 24 Find the need new
mean
​

Answer 1

Answer:

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

Answer 2

Answer:

hi, ur answer would be- 54.9

step by step explanation-

mean=sum.of observations/no of observations

here no of obs are 20 and mean is 54 so sum of observations=54×20=1080

42 is misread as 24

so correct mean =sum of obs-wrong obs+correct obs/no of obs

so 1080-24+42/20=54.9