Question

The Taylors Have recorded their weekly grocery expenses for the past 16 weeks and determined that the mean weekly expense was 84.50. Later , Mrs.Taylor discovered that 1 weeks expense of $84 was incorrectly recorded as $48 What is the correct mean ?

The correct mean is $ ____?

Answer 1

so total sum incorrect sum will be 84.50×16= 1352

so this contains 48 , right !!

so subtract 48 from sum and add 84
it will give 1352-48+84 = 1388

so new mean will be 1388/16= 86.75

thus the answer is 86.75 !!