The average height of 30 students is 150cm it was detetcted later that one value of 165 cm was wrongly as 135 cm for the compuyation of meam find the corect mean
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Given -
Mean Height = 150 cm
Total students = 30
Mean Height = Sum of heights / Total students
150 = Sum of heights / 30
Sum of heights = 150 × 30 = 4500
Now,
Incorrect number = 135 cm
Correct number = 165 cm
Difference = 165 - 135 = 30 cm
New sum of heights = 4500 + 30 = 4530 cm
New mean Height = New sum of heights / Total students
New mean = 4530 / 30
New mean = 151 cm
^^"
Mean Height = 150 cm
Total students = 30
Mean Height = Sum of heights / Total students
150 = Sum of heights / 30
Sum of heights = 150 × 30 = 4500
Now,
Incorrect number = 135 cm
Correct number = 165 cm
Difference = 165 - 135 = 30 cm
New sum of heights = 4500 + 30 = 4530 cm
New mean Height = New sum of heights / Total students
New mean = 4530 / 30
New mean = 151 cm
^^"
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??
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