Question

Q. The mean of 20
3 points
observations is 120. If , on
rechecking it was
detected that the value
75 was wrongly copied as
55 for computation of
mean. Find the correct
mean​

Answer 1

Answer:

given: Average of 20 observations=120

>total of 20 observations=2400

>now subtract 75 wg=2400-75=2325

now add 55 we get=2325+55=2380

thus new mean=2380/20=119

... hope itz done