Question

observation.
The mean of 8 observations of a data set 25. If two more observations 45 and 35 are added to
the data set, find the mean of the combined data set.​

Answer 1

Answer:

Step-by-step explanation:

Mean of 8 observations of a data set = 25

=> Mean = Sum of all observations / Number of observations

=> sum of all observations / 8 = 25

=> sum of all observations = 200

Now,

After adding 35 and 45 , number of observations = 10

And,

Sum of all observations, = 200 + 35 + 45

=> sum of all observations = 280

Now,

Mean = Sum of all observations / Number of observations

=> Mean = 280/10

=> Mean = 28

Hence, The new mean will be 28

Answer 2

Answer:

28

Step-by-step explanation:

given that

25=sum of all observations/total no of observations

25= sum of all obs

               8

25x8=sum of all obs

200=sum of all obs

on adding the new values

200+45+35=sum of all obs+45+35

280=sum new obs

mean= 280

            10

mean=28

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