Question

The mean of 100 numbers is 80 Later on it was discovered that two items were misread as 36 and 14 instead of 63 and ulo find the correct mean.​

Answer 1

Answer:

here given,

mean of 100 observations =64

we know that mean=sum of observations /no. of observations

64=sum/100

sum of observations =64000

here we observe that

mistaken observations =26,9

sum of mistaken observations =35

actual observations =36,90

sum of actual observations =126

here actual >mistaken

so,add the difference of them

difference of actual and mistaken is 126-35

=91

now mean=6400+91/100

=6491/100

=64.91

Step-by-step explanation: