Question

The mean of 100 observations is 25. If 1st number
is decreased by 1, 2nd
number is decreased
decreased by 3 and so on
2, 3rd number is
find the new mean.
75.5
25
0
-75
0
-25.5​

Answer 1

Explanation:

The first concept to understand from Mean Median and Mode is Mean. Mean is simply defined as the ratio of the summation of all values to the number of items. Note that there are two types of the arithmetic mean which are simple arithmetic mean and weighted arithmetic mean.

Mean = ∑X ÷ N

Here, ∑X= Sum of all the individual values and N= Total number of items

The simple arithmetic mean considers all the values in data as equal and grants equal importance to each value. Whereas, in weighted arithmetic mean weights or importance is assigned to the values. Without further delay let us study methods of constructing mean.

Answer 2

Answer:

which class do you read .............