Question

The average of 20 values is 18. If 3 is
subtracted from each of the values, then
the new average will be​

Answer 1

Answer:

If the average value of all the values is given and a constant number is substracted or added to all the numbers, then the average value also decreases or increases by the same constant number respectively.

In this question,

Average of 20 values = A = 18

Sum of all the 20 values= S = average * 20

=A*20

=18*20

=360

If 3 is substracted from each of the 20 values, then total value substracted = 3*20=60

Now new Total Sum = S1=S - 60

=360–60

=300

New Average = (New Sum) / 20

=300/20=15

Step-by-step explanation:

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