The arithmetic mean of 10 observations
is 12.45. If each reading is increased by
5, then resulting mean is increased by
(P.S.) ( )
A) 5 B) 0.5 C) 50 D) 5
Answers
Given : The arithmetic mean of 10 observations is 12.45. each reading is increased by 5
To Find : resulting mean is increased by
A) 5 B) 0.5 C) 50 D) 5
Solution:
The arithmetic mean of 10 observations is 12.45
Sum of all observations = Mean * number of observations
Sum of all observations = = 12.45 * 10
= 124.5
each reading is increased by 5
Hence 10 reading increased by 10 * 5 = 50
New Sum = 124.5 + 50 = 174.5
New Mean = 174.5/10
= 17.45
Mean increased by 17.45 - 12.45
= 5
option D is correct
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Answer:
0.5 is the answer. option b is correct answer