Question

Mean of 16 Numbers is 2o. If one Number 18 is
Misread as 98. Find the correct mean​

Answer 1

Answer: The correct mean is 15

Step-by-step explanation:

Mean of 16 numbers is 20

We know mean = sum of observations / no. of observations.

sum of observations = mean × no. of observations

                                   =20 ×  16

:.sum of observations=320

Now, the correct sum of observations should be  = 320 - 98+18

                                                                                   = 240

Thus , the correct mean = 240/16

       :. the correct mean =15

I hope this helps you! Kindly reply back if there's any problem with this answer. Have a great day! :D

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Answer 2

Answer:

Correct mean = 15

Step-by-step explanation:

N = 16

Incorrect Mean = 20

Therefore, incorrect sum = 16*20 = 320

Now,

Correct sum = 320 - 98 + 18 = 240

N remains the same, ie 16

So, correct mean = 240/16 = 15