Question

The average of 50 observations is 36. It was found later that an observation 48 was wrongly taken as 23. Find the correct average of the observations.

Answer 1

Answer:

Step-by-step explanation:

Let's say that the observation in mean

mean = sum of observations / no. of observations

  36   =  x / 50

  x      =  36* 50 = 1800

  One observation which was actually 48 was taken 23

  Correct sum = 1800 + ( 48 - 23 )

                        = 1800 +   25

                        = 1825

Correct observation = 1825 / 50

                                  = 36.5