The mean and standard deviation of 15 observations are found to be 10 and 5 respectively. On rechecking it was found that one of the observation with value 8 was incorrect Calculate the correct mean and standard deviation if the correct observation value was 23?
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Answered by
13
Answer:
the mean would be 11
Step-by-step explanation:
10 x 15=150
150 is the total amount of the observations added up.
150-8=142
you do this because 8 was the incorrect observation then you add 23.
165 divided by 15=11
Answered by
0
Answer:
The required mean of the observation is 11
Step-by-step explanation:
we know mean = summation of total observations / values
therefore the total summation = 10 x 15 = 150
Since, 8 is the wrong observation
therefore the correct summation excluding 8 is = 150 - 8 = 142
and add 23, because it is the correct value
therefore, summation = 142 + 23 = 165
now the correct mean = 165 / 15 = 11
#SPJ3
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