Question

mean of 50 b was found to be 80 but later on it was discovered that 96 was misread as a 69 find correct median

Answer 1

Hey!

♣ Mean and Median ♣

Here,
Sum of 50 observations = Mean * no. of observations
                                       = 80.4 * 50
                                       = 4020
Now, ATQ,
96 misread as 69.
So, new sum of observations:
= 4020 - 69 + 96
= 4020 + 27
= 4047

Now, New mean = sum of observations/ no. of observations
                            = 4047/50 
                            = 80.94
Hence, the correct mean is 80.94.