the average of 20 values is 18. if 3 is subtracted from each of the values , then the new average will be
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8
Answer:
15
Step-by-step explanation:
Let, sum of 20 values be x
Avg. = x/20 = 18
If 3 is subtracted from each value then
New sum = x - 20*3
New avg. = ( x - 20*3)/20
= x/20 - (20*3)/20
= 18 - 3 = 15
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