Question

the mean of 25 scores was termed to the 64 . later on it was disconvienced that the two values which were 60 and 90 were wrongly recorded as 16 and 59. find the correct mean​

Answer 1

Answer:

67

Step-by-step explanation:

Mean=Sum of all observations/Total no. of observations

64=Sum of all observation/25

Sum of all observation=64*25

                                    =1600

Wrong recorded observation 16 and 59,

Sum of observation=1600-(16+59)

                                =1600-75

                               =1525

Correct values 60 and 90

New sum of observation=1525+(60+90)

                                        =1525+150

                                       =1675

New mean=1675/25

                =67