Thomas
Jan 18, 2021

answers: 1

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Answer:

Answer :

The required mean of all 35 observation is 64.1428

Step-by-step explanation :Given :

- the mean of 25 observations is 65
- the mean of next 10 observations is 62

To find :

the mean of all 35 observations

Solution :

The mean of 25 observations is 65 :

65 = sum of 25 observations/25

sum of 25 observations = 65 × 25

sum of 25 observations = 1625

The mean of next 10 observations is 62 :

62 = sum of next 10 observations/10

sum of next 10 observations = 62 × 10

sum of next 10 observations = 620

The mean of all 35 observations :

Required mean = sum of 25 observations + sum of next 10 observations/35

Required mean = 1625 + 620/35

Required mean = 2245/35

Required mean = 449/7

Required mean ≈ 64.1428

Therefore, the mean of all 35 observation is 64.1428

17

ThomasMar

Jan 18, 2021

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