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Q.

The mean of 13 observations is 35. Three more observations with the same values are included, and the new mean becomes 32. Find the value of the new observations.

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a

19

b

22

c

23

d

29

answer is A.

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Detailed Solution

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Given that the initial mean of 13 observations is 35.

As, 

Mean = Sum of all observationsNumber of observations

→ 35 = Sum of Initial Observations13

→ Sum of initial observations = 13 × 35 

Sum of initial observations = 455

 

Now, three more observations with the same values are included, and the new mean becomes 32.

Let the value of each new observation be x.

After adding 3 new observations, the total number of observations becomes: 13 + 3 = 16

Then, 

The new sum of all 16 observations = 16 × 32 = 512

Now, 

To find the sum of the 3 new observations, subtract the sum of the initial 13 observations from the sum of all 16 observations:

→ 512 - 455 = 57

So, the sum of the three new observations is 57. 

Since there are 3 new observations with the same value are added.

Then, the value of each new observation 573 = 19 

 

Therefore, the value of each new observation is 19.

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