Question

The mean of 9 numbers is 50. If one number is included, their mean becomes 55. Find the
included number
intermine the median of the observations 24, 23, a, a -1, 12, 16, where a is the mean of 10z​

Answer 1

Answer:

The no included=100

mean =23

Step-by-step explanation:

The mean of 9 numbers is 50

so sum=50*9=450

let the number included is x

then mean=(x+450)/10=55

x+450=550

x=100

So the no included=100

-------------------------------

a=mean of 10 observations a=55

so observations are:24, 23, 55, 55 -1, 12, 16

arranging data in ascending order

-1,12,16,23,24,55,55

Here 23 in the middle

Thus mean=13