Question

the mean of first five observation is 20 and the mean of last 5 observation os 45.what is mean of all 10 observation​

Answer 1

Answer:

mean = Sum of observations/No. of observations

Here,

Mean of first 5 observations = 20

So with the help of above formula we can say, sum of first 5 observations = 20*5 = 100

Similarly, the sum of last 5 observations = 45*5 = 225

So, the total sum of 10 observations = 100+225 = 325

Hence mean = 325/10 = 32.5

Step-by-step explanation:

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